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>

openvswitch.spec

@@ -30,7 +30,7 @@ ExcludeArch: ppc
 
 BuildRequires: autoconf automake libtool
 BuildRequires: systemd-units openssl openssl-devel
-BuildRequires: python python-twisted-core python-zope-interface PyQt4 python-six
+BuildRequires: python python-twisted-core python-zope-interface python-six
 BuildRequires: desktop-file-utils
 BuildRequires: groff graphviz
 # make check dependencies