Tweaks for Jenkins:

* fixtures.virtual_machine now uses the mgmt_system methods to detect the VM state.
* Creating VM via create_on_provider now checks and waits for the VM to appear in CFME (required for scvmm as it is very slow)
* Modified waiting procedures on has_no_providers fixture, now it should be reading the numbers properly
Merge pull request #1360 from mfalesni/jenkins-tweaks

Tweaks for Jenkins: