OSP-119: update spec file for rhel rpm builds
OSP-119: update spec file for rhel rpm builds

 - without this, rpmbuild would fail because it will see files
   that exist but are not part of any package
 - we're introducing a new package - hence addition to the spec
   file

Change-Id: I3c2c46f7e3183973ecfac2009e85d44daf8063fb

stackforge/networking-bigswitch,openstack/networking-bigswitch,wolverineav/networking-bigswitch,openstack/networking-bigswitch,wolverineav/networking-bigswitch,stackforge/networking-bigswitch