VPX_Settings_Fixes

- Made the getter / setter public in the vc_vpxsettings provider
Merge pull request #118 from dscherer/vpx_settings

VPX_Settings_Fixes
retry and sleep on datastore create since it's async.
Merge pull request #119 from nanliu/datastore

retry and sleep on datastore create since it's async.
PowerOff VM Fixes

- Fixed a bug when powering off a VM that had vmtools running
- Added a flag to allow forcible poweroff of VMs that are running
  vmtools
- Added checks for shutdownGuest call and eventual force powerOff after
  2.5 minutes.
Merge pull request #120 from dscherer/poweroff_vm_fixes

PowerOff VM Fixes