adamverse: add --no-deps to pip install commands
    
    In various roles I maintain I use `python3 -m pip install` to
    directly install a Python project (usually a fedora-messaging
    consumer), to avoid the pointless bureaucracy of packaging them.
    The roles install all the deps of these projects as packages
    first, so pip doesn't have to install any deps, it only installs
    the project itself. Well...that's the idea. It's possible for
    this to go wrong (say I forget to update the roles when adding
    a dep to the project), and in that case I think we'd rather have
    things blow up (so I know something's wrong) than have pip
    silently install some random upstream wheel system-wide to make
    it work. The intent is that all the deps still come from proper
    Fedora packages, only these projects themselves get installed
    directly.
    
    Signed-off-by: Adam Williamson <awilliam@redhat.com>