qmp: Add GetFd() wrapper around getfd command
qmp: Add GetFd() wrapper around getfd command

getfd qmp command will be used to pass an fd using SCM_RIGHTS
and name it properly so that NIC hot-add can take place.

Signed-off-by: Dimitris Aragiorgis <4514117c4a99256e19437c7e3407c4ecbf98aec0@grnet.gr>
Reviewed-by: Hrvoje Ribicic <be5828fca31f89218048bec4189e30a581aa65da@google.com>

leshchevds/ganeti,grnet/snf-ganeti,leshchevds/ganeti,bitemyapp/ganeti,mbakke/ganeti,grnet/snf-ganeti,onponomarev/ganeti,mbakke/ganeti,mbakke/ganeti,andir/ganeti,ganeti/ganeti,yiannist/ganeti,yiannist/ganeti,dimara/ganeti,apyrgio/ganeti,apyrgio/ganeti,bitemyapp/ganeti,onponomarev/ganeti,yiannist/ganeti,andir/ganeti,leshchevds/ganeti,andir/ganeti,ganeti/ganeti,dimara/ganeti,ganeti/ganeti