Removed _CheckNodesFreeDisk function
Removed _CheckNodesFreeDisk function

Was substituted by _CheckNodesFreeDiskPerVG.

Signed-off-by: Dmitry Chernyak <974349a0da6bf8fa50aa6965dbde092222636a4a@gmail.com>
Signed-off-by: Iustin Pop <acf83a5274f31a43af6b914614365999469c1a31@google.com>
Reviewed-by: Iustin Pop <acf83a5274f31a43af6b914614365999469c1a31@google.com>

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