build: Clean up ovs-monitor-ipsec.

This fixes travis distcheck:

  ERROR: files left in build directory after distclean:
  ./ipsec/ovs-monitor-ipsec
  make[1]: *** [distcleancheck] Error 1

Acked-by: Timothy Redaelli <tredaelli@redhat.com>
Fixes: d5cc46e ("ipsec: Use @python@ directly instead of "/usr/bin/env python"")
Signed-off-by: Ilya Maximets <i.maximets@samsung.com>
Signed-off-by: Ben Pfaff <blp@ovn.org>

ipsec/automake.mk

@@ -8,3 +8,4 @@
 bin_SCRIPTS += ipsec/ovs-monitor-ipsec
 EXTRA_DIST += ipsec/ovs-monitor-ipsec.in
 FLAKE8_PYFILES += ipsec/ovs-monitor-ipsec.in
+CLEANFILES += ipsec/ovs-monitor-ipsec