Some improvements to RPM spec files:
  * Generate openvswitch-lib package using sharedlibraries
  * Include temporary debug headers in the openvswitch-devel package
  * Fix erroroneus build requires lines that prevent building on RHEL7
  * Fix kernel mod package to install depmod override config file and
    allow building against any kernel version by specifying on the
    command line.

Signed-off-by: Rob Adams <readams@readams.net>