Implement new command @Rtconfig importPG for junos to make import polici...

...es work with peer groups.

eg:
@RtConfig importPG <My AS> <My IP> <Peer AS> <Peer IP> <peer group name>

This is the same as regular import with the addition of a peer group name as the last argument.  This then causes output like:

protocols {
   bgp {
      group peers-prng-<peer group name> {
         type external;
         neighbor <Peer IP> {
            import [ <route map name> ];
         }
      }
   }
}