added vm_status methods
updated power control for per provider
Merge branch 'vm_power_control' of git://github.com/dajohnso/cfme_tests into add-ec2-mgmtsystem

Conflicts:
	tests/common/mgmt_system.py
Implemented extensions to the MgmtSystem API
Added EC2 support to setup_mgmt_systems fixture
Added some credentials and data templates for the EC2 mgmt system