rhsm_release: improve the execution of subscription-manager (#6669)

- pass the arguments to run_command() directly as list, rather than
  joining the arguments to string, which run_command() will need to
  split again
- disable the expansions of variables, as there are none

Adapt the unit test to the different way run_command() is called,
factorizing the kwargs for run_command() so there is less repetition.

There should be no behaviour changes.

plugins/modules/rhsm_release.py

@@ -77,9 +77,9 @@ def _sm_release(module, *args):
     # pass args to s-m release, e.g. _sm_release(module, '--set', '0.1') becomes
     # "subscription-manager release --set 0.1"
     sm_bin = module.get_bin_path('subscription-manager', required=True)
-    cmd = '{0} release {1}'.format(sm_bin, " ".join(args))
+    cmd = [sm_bin, 'release'] + list(args)
     # delegate nonzero rc handling to run_command
-    return module.run_command(cmd, check_rc=True)
+    return module.run_command(cmd, check_rc=True, expand_user_and_vars=False)
 
 
 def get_release(module):