Chery-picked From: 7c750e32

Users can now specify the default user when using an SSL client certificate.

See merge request !3

Luke Bertot authored 5 years ago and SIMONIN Matthieu committed 5 years ago

Internal certificate. In this mode users can pass the g5k_user argument
to most calls to specify which user the API call should be made as. In
cases where g5k_user is not specified API calls will be made as the
anonymous user whose access is limited to the Grid’5000 reference API.
In this mode python-grid5000 does not store any login information, so
g5k_user must be provided explicitly provided on every call that requires
one.

from_yaml fallbacks to anonymous connection

Closes #6

See merge request !1

Fix #6