The 'openvswitch-common' package did not work well with cross-compiling
since it required Python.  This package is broken into two packages as
follows:
- libopenvwitch: contains library files (.a, .so)
- openvswitch-common: depends on libopenvswitch, contains command-line
  tools such as ovs-ofctl, ovs-appctl etc.

In addition, this 'openvswitch-dev' library is renamed to
'libopenvswitch-dev' to align more closely with Debian policy.  It
depends on libopenvswitch.

Signed-off-by: Ben Warren <ben@skyportsystems.com>
Signed-off-by: Ben Pfaff <blp@ovn.org>