Cloudregistration test module improvements

[linguini-dev]

We have a list of manual steps which are executed to verify cloud-regionsrv-client. The steps can be found here: https://github.com/SUSE-Enceladus/cloud-regionsrv-client/blob/master/integration_test-process.txt

Our existing automated tests did not cover all of the steps listed so this PR aims to remedy that.

This PR:

• Adds missing steps to the test module.
• Removes duplicate imports (e.g. use version_utils 'is_sle';)
• Defines a few new functions. These are used to retain the existing logical flow of the test while adding some extra steps along the way.
• Swaps piped commands for simpler (imo) options. e.g. ls /etc/zypp/credentials.d/ | wc -l vs ls -A /etc/zypp/credentials.d/.
• Adds steps to verify container runtimes.
• Executes Tidy on the code, hence the last empty line.

Additional info:

• Related ticket: https://progress.opensuse.org/issues/165881
• Needles: N/A

Verification runs:

• SLE 12:
  • http://dirtman.qe.prg2.suse.org/tests/72
  • http://dirtman.qe.prg2.suse.org/tests/86
• SLE 15-SP6
  • http://dirtman.qe.prg2.suse.org/tests/84#step/check_registercloudguest/4
  • http://dirtman.qe.prg2.suse.org/tests/89#step/check_registercloudguest/4

[m-dati]

CI claiming tidy needed

[asmorodskyi]

LGTM

[linguini-dev]

We had a discussion with @asmorodskyi, that is the intended behavior and has worked like that so far. I am just removing one of the checks as it is impossible due to us not supporting versions that old.

[linguini-dev]

As per the comment, # 15-SP2 is the oldest version that needs fullpaths i.e. No other version needs the fullpath, so no need to use it.