This commit changes the pip_install_options fact name in
nova_install.yml to pip_install_options_fact. This allows us to
maintain the existing pip_install_options variable without overwriting
it with options when in developer mode, which ultimately means we can
have multiple services running in a container use a combination of
*_developer_mode: true and *_developer_mode: false. At the moment,
if a service writes pip_install_options fact with the constraints
options, those options will persist to other services running in the
container even if *_developer_mode: false.
Change-Id: Ifbc0e3e345e321b908088d3ea7fc1b1041ae084b
73a5c69006