console: Rework power on/off retry mechanism

console: Rework power on/off retry mechanism

We were only ever issuing the inital request once; Now, after five unsuccessful
checks to see that the node is in the desired state, we re-issue the request but
do not reset the clock.
We were also checking the power state immediately after sending the request,
which is unhelpful as the operation will never complete that quickly. Now, we
sleep at least once.

Signed-off-by: Zack Cerza <zack@redhat.com>