Cluster verify: make NV_NODELIST smaller
Cluster verify: make NV_NODELIST smaller

To cope with increasing cluster sizes, we now make nodes try to contact all
other nodes in their group, and one node from every other group.

Signed-off-by: Adeodato Simo <16293852a0900193fe70fa7d24f714f37ba99a56@google.com>
Signed-off-by: Guido Trotter <f62ca4d5358bdaeef0e50e57f9f7e231de63727e@google.com>
Reviewed-by: Iustin Pop <acf83a5274f31a43af6b914614365999469c1a31@google.com>

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