This commit conditionally allows the os_cinder role to
install build and deploy within a venv. This is the new
default behavior of the role however the functionality
can be disabled.
Implements: blueprint enable-venv-support-within-the-roles
Change-Id: Icd764b78ee887f4fe2ecd4bb67b97ae4651e6fa3
Signed-off-by: Kevin Carter <kevin.carter@rackspace.com>