Fix wrong CONFIG_PROVSION_TEMPEST test

- Marshall_conf_bool() is just converting ['y'|'n'] into ['true'|'false'] which
  are Puppet Boolean value !
- Need to check the Python Boolean Value instead !

Change-Id: I4d9df5c7643f19aefd2fe2c6e95a2f086c756bd0
Revert "Better Hardware Virt Support checking"

is_virtual_packstack custom fact checks if packstack is running on a
virtualized system. So checking for 'vmx' or 'svm' flags is useless !

This reverts commit 5c357a8dd3c04a4eac7f9a106ae64ea5bc38eecc.

Change-Id: I81f9444a787712cb1c5e676256d6a7c6ebdf84bf