ipsec: Install ovs-monitor-ipsec in script directory

ipsec: Install ovs-monitor-ipsec in script directory

In commit d5cc46e3d185 ("ipsec: Use @PYTHON@ directly instead of
"/usr/bin/env python"") ovs-monitor-ipsec is installed in bin directory,
but it's supposed to be installed in script directory.

This commit removes also the manual copy of "ovs-monitor-ipsec" in spec file
since it's installed directly in "make install".

Fixes: d5cc46e3d185 ("ipsec: Use @PYTHON@ directly instead of "/usr/bin/env python"")
Signed-off-by: Timothy Redaelli <tredaelli@redhat.com>
Signed-off-by: Ben Pfaff <blp@ovn.org>