Remove PyQt4 dependency
    
    commit 06c58061d485e25eaa24c6b3eaf5e3a8ccb40ff7
    Author: Joe Stringer <joe@ovn.org>
    Date:   Thu Jul 14 17:53:46 2016 -0700
    
        packaging: Remove PyQt4 dependency.
    
        This doesn't seem to have been necessary since ovsdbmonitor was removed
        in commit 7868fbc6c97c ("ovsdbmonitor: Remove."). Drop the dependency.
    
        Signed-off-by: Joe Stringer <joe@ovn.org>
        Acked-by: Ben Pfaff <blp@ovn.org>
    
    Signed-off-by: Timothy Redaelli <tredaelli@redhat.com>