system name in previous call needs to be the same:

my fault: actually test_rhsm_ForceReg uses that exact system name in order to make called (and assert) that system gets unregistered first.

hope this commit helps.

thanks Tazim for finding this out.
remove dependency from test_rhsm_ForceReg
Merge remote-tracking branch 'upstream/master'
moved consuming package group content test into new class