Include node name in hypervisor validation errors
Include node name in hypervisor validation errors

The current validation routine just says "failed", without specifying
the node name. This is very confusing, and we should log the node name
too.

Signed-off-by: Iustin Pop <acf83a5274f31a43af6b914614365999469c1a31@google.com>
Reviewed-by: Alexander Schreiber <d79673dae93c3dc95c222708a03b3bbd3a746b44@google.com>

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