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tests: Fix hangs and improve error handling

See merge request !19

Once the fake actor scenario is over, the fake actor starts running
(again) the client-side of the test. Although this is usually harmless
because the client-side quickly blocks waiting for the server to
accept the connection to its socket, fix this by exiting after making
sure that the client side is done (either by destroying ScenarioRunner
or by exiting abnormally).

The signal handler of SIGQUIT calls exit() which is not signal safe.
This sometimes leads to deadlocks (see the backtrace below where
pthread_mutex_lock() is interrupted by the signal and called on the
same lock by exit()). To fix this just call _exit().

 (gdb) bt
 #0  0x0000792090f0f5cb in __lll_lock_wait () from target:/lib/x86_64-linux-gnu/libpthread.so.0
 #1  0x0000792090f08211 in pthread_mutex_lock () from target:/lib/x86_64-linux-gnu/libpthread.so.0
 #2  0x0000792090f4735f in ?? () from target:/lib64/ld-linux-x86-64.so.2
 #3  0x0000792090a0a537 in ?? () from target:/lib/x86_64-linux-gnu/libc.so.6
 #4  0x0000792090a0a6da in exit () from target:/lib/x86_64-linux-gnu/libc.so.6
 #5  0x00005a95f258ed39 in sigquit (signum=3) at /usr/include/c++/11/bits/catch.hpp:18
 #6  <signal handler called>
 #7  0x0000792090f08193 in pthread_mutex_lock () from target:/lib/x86_64-linux-gnu/libpthread.so.0
 #8  0x0000792090f2a40d in dlsym () from target:/lib/x86_64-linux-gnu/libdl.so.2
 #9  0x00005a95f24cba89 in std::sys::unix::weak::fetch (name=<optimized out>)
     at library/std/src/sys/unix/weak.rs:101
 #10 std::sys::unix::weak::Weak<F>::initialize (
     self=0x5a95f2847c88 <std::sys::unix::rand::imp::getrandom::getrandom::getrandom>)
     at library/std/src/sys/unix/weak.rs:85
 #11 0x00005a95f267f398 in std::sys::unix::weak::Weak<F>::get (self=<optimized out>)
     at library/std/src/sys/unix/weak.rs:54
 #12 std::sys::unix::rand::imp::getrandom::getrandom (buffer=0x7ffd9778bd10, length=16, flags=1)
     at library/std/src/sys/unix/weak.rs:135
 #13 std::sys::unix::rand::imp::getrandom (buf=...) at library/std/src/sys/unix/rand.rs:44
 #14 std::sys::unix::rand::imp::getrandom_fill_bytes (v=...) at library/std/src/sys/unix/rand.rs:69
 #15 std::sys::unix::rand::imp::fill_bytes (v=...) at library/std/src/sys/unix/rand.rs:102
 #16 0x00005a95f2691808 in std::sys::unix::rand::hashmap_random_keys ()
     at library/std/src/sys/unix/rand.rs:8
 #17 0x00005a95f25dbffa in std::thread::local::fast::Key<T>::try_initialize ()
 #18 0x00005a95f25ddccd in <clap::args::arg_matcher::ArgMatcher as core::default::Default>::default ()
 #19 0x00005a95f26ce92d in clap::app::App::get_matches_from_safe ()
 #20 0x00005a95f26c8171 in tansiv_client::init ()
 #21 0x00005a95f25915fc in vsg_init ()
 #22 0x00005a95f24f8373 in ____C_A_T_C_H____T_E_S_T____9 () at /usr/include/c++/11/bits/atomic:145
 #23 0x00005a95f24e486c in Catch::TestInvokerAsFunction::invoke (this=0x5a95f39586c0)
     at /srv/src/build/std_abs.h:14321
 #24 0x00005a95f24e3bb3 in Catch::TestCase::invoke (this=0x5a95f3969f68)
     at /srv/src/build/std_abs.h:14160
 #25 0x00005a95f24de7ff in Catch::RunContext::invokeActiveTestCase (this=0x7ffd9778cf30)
     at /srv/src/build/std_abs.h:13020
 #26 0x00005a95f24de583 in Catch::RunContext::runCurrentTest (this=0x7ffd9778cf30, redirectedCout=...,
     redirectedCerr=...) at /srv/src/build/std_abs.h:12993
 #27 0x00005a95f24dd211 in Catch::RunContext::runTest (this=0x7ffd9778cf30, testCase=...)
     at /srv/src/build/std_abs.h:12754
 #28 0x00005a95f24dff27 in Catch::(anonymous namespace)::TestGroup::execute (this=0x7ffd9778cf20)
     at /srv/src/build/std_abs.h:13347
 #29 0x00005a95f24e1203 in Catch::Session::runInternal (this=0x7ffd9778d230)
     at /srv/src/build/std_abs.h:13553
 #30 0x00005a95f24e0f48 in Catch::Session::run (this=0x7ffd9778d230) at /srv/src/build/std_abs.h:13509
 #31 0x00005a95f251ee17 in Catch::Session::run<char> (this=0x7ffd9778d230, argc=2, argv=0x7ffd9778d4c8)
     at /srv/src/build/std_abs.h:13231
 #32 0x00005a95f24f636f in main (argc=2, argv=0x7ffd9778d4c8) at /srv/src/build/std_abs.h:17526

tests: Fix logic of test "VSG send piggyback port"

See merge request !18

Fix two flaws:
- depending on execution timings, AtDeadline messages can arrive
  before the actor receives a SendPacket message;
- failing to decode the right port could just result from no
  DeliverPacket message received at all.

For #23

CI: Avoid duplicate pipelines when open merge requests exist for a branch

See merge request !16

See https://gitlab.inria.fr/help/ci/yaml/README.md#switch-between-branch-pipelines-and-merge-request-pipelines

CI: Fix logic to reuse an existing container image when pushing tags

Closes #18

See merge request !17

Finish renaming / moving tansiv components according to #21

Closes #21

See merge request !13

For #18

boot.py: now use a more persistent working dir

See merge request !15

When a VM start a working dir is created prefixed by the hostname of the
VM.
It'll contains all the file needed to boot the VM (cloud-init, base
qcow image).
Also it can be used to store specific files (pcap dumped file ...)
coming from the extra args passed to qemu.

Note the stdout file is store there by default (`out`)

For #21

For #21

This remove the logic associated to setting a concurrency limit on the
links.

We'll revert this commit in a dedicated branch apply the limit (so reverting
the revert to restore it :) )

+ some styling

debian11 / gcc11/ qemu6.1.0 / ci debian testing support

See merge request !14

see https://www.gnu.org/software/gcc/gcc-11/porting_to.html

- Launcher scripts: notansiv.py / boot.py
  + Make them part of the tansiv distribution
    - CMake update
    - Docker update
- Udpdate README
- Update base debian image to debian11

For #21

In cloned repositories, need to run `git submodule sync` to update the
repository information.

We've updated the location of the installation for our lib / includes
So we've to update the way thinks are included/linked on the qemu side

Fix #24

Closes #24

See merge request !12