fixes for lost quorum and general speedup

* Changes to # check ceph health

a) If the Ceph cluster loses quorum, 'ceph health' will just block and
thus your cron job would block as well. I added a 30 second time out
for this reason.

b) 'ceph health' and 'ceph health detail' have identical run times for
healthy clusters, so you can skip one of these queries by outputting
the $HEALTH contents if needed.

c) Used "echo -n" (no newline at the end) where the following
information is rather short

* Changes to # get logs for last hour

Instead of forking the script 60 times to call sed and cause disk io
x60, you can just use awk and do everything in one go.

"echo -n" like above.

* Changes to the checks sections:

Same thing as 'b' above, since you already store the information in a
variable, there's no need to gather them a second time.

Tested-by: Dan van der Ster <daniel.vanderster@cern.ch>