Fix for issue 915

The xvpvncproxy is not equally supported on RHEL and Ubuntu alike,
so this fixes the issues in our cookbooks with the missing package
in RHEL by removing it from our cookbooks.  It no longer makes sense
to support the installation and monitoring of the installation of
xvpvnc when it the package is not supported on both RHEL and Ubuntu.

Issue:
https://github.com/rcbops/chef-cookbooks/issues/915
(cherry picked from commit 60c662d35ef5902f000e6f0583f25b7ca2cc6604)