datapaths.pcap_switch: Allow reuse of ctl server
datapaths.pcap_switch: Allow reuse of ctl server

This allows multiple datapaths to use the same ctl server.  Before
it only really worked for a single DP.

MurphyMc/pox,MurphyMc/pox,noxrepo/pox,noxrepo/pox,MurphyMc/pox,noxrepo/pox,MurphyMc/pox,noxrepo/pox,MurphyMc/pox