[generator] [kadeploy] Allow to configure the install_bootloader script

Caution: we set no default value, so the g5k configuration (in
g5k-platform-production) needs to be updated!
5 jobs for install_bootloader in 35 seconds (queued for 11 minutes and 12 seconds)
Name Stage Failure
failed
rubocop Validate There has been a runner system failure, please try again
Using Docker executor with image debian:buster ...
Pulling docker image debian:buster ...
ERROR: Preparation failed: Error response from daemon: toomanyrequests: You have reached your pull rate limit. You may increase the limit by authenticating and upgrading: https://www.docker.com/increase-rate-limit (docker.go:142:1s)
Will be retried in 3s ...
Using Docker executor with image debian:buster ...
Pulling docker image debian:buster ...
ERROR: Preparation failed: Error response from daemon: toomanyrequests: You have reached your pull rate limit. You may increase the limit by authenticating and upgrading: https://www.docker.com/increase-rate-limit (docker.go:142:1s)
Will be retried in 3s ...
ERROR: Job failed (system failure): Error response from daemon: toomanyrequests: You have reached your pull rate limit. You may increase the limit by authenticating and upgrading: https://www.docker.com/increase-rate-limit (docker.go:142:1s)
failed
validate-data Validate There has been a runner system failure, please try again
Using Docker executor with image debian:buster ...
Pulling docker image debian:buster ...
ERROR: Preparation failed: Error response from daemon: toomanyrequests: You have reached your pull rate limit. You may increase the limit by authenticating and upgrading: https://www.docker.com/increase-rate-limit (docker.go:142:1s)
Will be retried in 3s ...
Using Docker executor with image debian:buster ...
Pulling docker image debian:buster ...
ERROR: Preparation failed: Error response from daemon: toomanyrequests: You have reached your pull rate limit. You may increase the limit by authenticating and upgrading: https://www.docker.com/increase-rate-limit (docker.go:142:1s)
Will be retried in 3s ...
ERROR: Job failed (system failure): Error response from daemon: toomanyrequests: You have reached your pull rate limit. You may increase the limit by authenticating and upgrading: https://www.docker.com/increase-rate-limit (docker.go:142:1s)