debian: Install ovs-vswitchd.conf.db(5) manpage.

This manpage wasn't getting installed.  This fixes it.

The --language=C option to dh_installman is necessary to keep that script
from thinking that the ".db" suffix indicates a translation into the "db"
language (which doesn't actually exist) and therefore installing it into
the wrong directory with the .db suffix stripped.

Bug #8138.
Reported-by: Ethan Jackson <ethan@nicira.com>

Author: blp

debian/openvswitch-switch.manpages

@@ -5,3 +5,4 @@ _debian/utilities/ovs-tcpundump.1
 _debian/utilities/ovs-vlan-test.8
 _debian/utilities/ovs-vsctl.8
 _debian/vswitchd/ovs-vswitchd.8
+_debian/vswitchd/ovs-vswitchd.conf.db.5

debian/rules

@@ -120,7 +120,7 @@ binary-common:
 	dh_installinit -R -Nopenvswitch-switch
 	dh_installinit -R -popenvswitch-switch --error-handler=init_script_error
 	dh_installcron
-	dh_installman
+	dh_installman --language=C
 	dh_link
 	dh_strip --dbg-package=openvswitch-dbg
 	dh_compress