Build: fix distribution and installation of static files in top-level directory
    
    Static files from Git which are not touched by the build system
    have to be explicitly listed in Makefile.am so they get into tarball.
    
    ipa script was missing on installed systems for the same reason.
    
    https://fedorahosted.org/freeipa/ticket/6418
    
    Reviewed-By: Martin Basti <mbasti@redhat.com>
    Reviewed-By: Christian Heimes <cheimes@redhat.com>