Fix for some system tests

One of the system tests required a system to get migrated to a
new environment. So added a step to promote the Content View from
TEST_ENV to TEST_ENV_2 so that the same cv is availbale in the new
environment
Adding the Update method for Providers to both Headpin and Katello mode.
Merge pull request #58 from omaciel/addmebackbro

Adding the Update method for Providers to both Headpin and Katello mode.
Merge pull request #57 from parthaa/system-test-fix

Fix for some system tests
Fix content views handling in system tests

The global content view "$TEST_VIEW" was incorrectly used in various
places.
Merge pull request #59 from iNecas/fix-system-tests

Fix content views handling in system tests
Fix rhsm-related system tests
Merge pull request #60 from iNecas/fix-system-tests

Fix rhsm-related system tests