Fixes to elabinelab vlan creation. I am not actually sure why things
broke, but I decided that relying on stdout vs stderr in the xmlrpc server, to return results is a bad plan. Instead, the rpc server passes a new option to specify an output file that snmpit.proxyv2 should write the results to. After the proxy runs, grab the contents of that file and send back to the calling elabinelab. Note that you will need to update tbsetup/snmpit_remote.in and install it, in your elabinelab.