Hide virt env label and field
Added some scripting around the use_pfs and use_virtualenv fields to toggle visibility of use_virtualenv based on value of use_pfs.  Also changed open labels to true/false instead of yes/no to be consistant with rest of barclamps
Merge pull request #39 from dpaterson/pull-req-release-mesa-1.6-master-a0a6d0c6f31ef7e7ca3a998f778204cf6ed9cbc3

https://github.com/crowbar/barclamp-tempest/pull/39

Merged by devtool for ArkadyKanevsky
Merge pull request #40 from dpaterson/pull-req-release-mesa-1.6-master-85dc77871d1c538d3392169ca5d115d9705b1b34

https://github.com/crowbar/barclamp-tempest/pull/40

Merged by devtool for ArkadyKanevsky