Add regression test to check the environment

[lucamar]

We have recently experienced several changes in the environment on the TDS system (e.g.: new NVIDIA driver, new Linux kernel, new Programming Environment...) and the list of modules loaded at the time we build and run applications unfortunately is not enough to have a full picture.

It would be therefore useful to have a test environment_check that does at least the following:

rpm -qa
env
module -t avail 2>&1

The data can be compared against a reference list of rpm, env and module commands (filtering default ones in the last case, for instance) and raise a WARNING or FAIL in case of a mismatch.

[victorusu]

We should also check the compute node images. The proper command for that is
rpm --root=$(findmnt -t squashfs /dev/loop3 -o target -f -n) -qa | sort