Version RPC call
Version RPC call

Implementation of node version query.

Signed-off-by: Agata Murawska <4c8886dbe342c6966e25105100cfee09458faa93@google.com>
Reviewed-by: Iustin Pop <acf83a5274f31a43af6b914614365999469c1a31@google.com>

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