LUSetNodeParams/LUOobCommand respect offline/powered
LUSetNodeParams/LUOobCommand respect offline/powered

This patch makes sure we cross verify the state the node is
in with our view:

power off -> Node has to be set offline
modify -O no -> Node has to be powered

Signed-off-by: René Nussbaumer <bc755ac45a0e799d1d490cba76febc56d80cc5fc@google.com>
Reviewed-by: Iustin Pop <acf83a5274f31a43af6b914614365999469c1a31@google.com>
Reviewed-by: Michael Hanselmann <68b67885ff74281219b4a4be33cc20fd45078d7c@google.com>

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