debian: Allow kmod or module-init-tools for backward compatibility.

Commit d473844 (debian: Depend on 'kmod' instead of module-init-tools.)
switched from depending on module-init-tools to depending on kmod, which
is the new name of the appropriate package in Debian.  Unfortunately,
while kmod is the right name for the latest Debian distribution, it doesn't
have that name in old distributions and thus breaks the build on those.
This commit should work OK in either case, since it allows both names.

Signed-off-by: Ben Pfaff <[email protected]>
Acked-by: Justin Pettit <[email protected]>
Acked-by: Gurucharan Shetty <[email protected]>

debian/control

@@ -65,7 +65,7 @@ Description: Open vSwitch common components
 Package: openvswitch-switch
 Architecture: linux-any
 Suggests: openvswitch-datapath-module
-Depends: ${shlibs:Depends}, ${misc:Depends}, ${python:Depends}, openvswitch-common (= ${binary:Version}), kmod, procps, uuid-runtime, netbase, python-argparse
+Depends: ${shlibs:Depends}, ${misc:Depends}, ${python:Depends}, openvswitch-common (= ${binary:Version}), kmod | module-init-tools, procps, uuid-runtime, netbase, python-argparse
 Description: Open vSwitch switch implementations
  Open vSwitch is a production quality, multilayer, software-based,
  Ethernet virtual switch. It is designed to enable massive network