Fix ceilometer installation on compute node

The ceilometer agent running on the compute node must be configured to
access other services (keystone and AMQP). Add the missing information.

Also explicitly define log_dir for ubuntu (don't use a note).

Remove ... in program listings.

Change-Id: I3a339c5c8ccabf7c7d307357834eb8dada71271c
backport: havana
Remove image requirement for boot from volume

Section previously implied an image had to be specified
when booting from volume. This was true previously but
has since been corrected and thus it is not necessary
to specify an image to successfully boot from a volume.

Change-Id: I85d61726f00ece33e453ad739c4955b5f8082353
Closes-Bug: #1269767
Merge "Fix ceilometer installation on compute node"