cfgupgrade for networks
cfgupgrade for networks

Add networks slot in config data.
Add networks slot in nodegroups.

Signed-off-by: Dimitris Aragiorgis <4514117c4a99256e19437c7e3407c4ecbf98aec0@grnet.gr>
Reviewed-by: Iustin Pop <acf83a5274f31a43af6b914614365999469c1a31@google.com>

onponomarev/ganeti,yiannist/ganeti,apyrgio/snf-ganeti,leshchevds/ganeti,mbakke/ganeti,yiannist/ganeti,ganeti/ganeti,leshchevds/ganeti,ganeti/ganeti,dimara/ganeti,mbakke/ganeti,andir/ganeti,dimara/ganeti,ganeti-github-testing/ganeti-test-1,ganeti-github-testing/ganeti-test-1,bitemyapp/ganeti,onponomarev/ganeti,grnet/snf-ganeti,leshchevds/ganeti,andir/ganeti,apyrgio/ganeti,apyrgio/ganeti,andir/ganeti,grnet/snf-ganeti,yiannist/ganeti,apyrgio/snf-ganeti,ganeti/ganeti,mbakke/ganeti,bitemyapp/ganeti