fix compute units in measurement doc

related to bug#1165123 and patch (https://review.openstack.org/#/c/26462)

memory: B to MB
disk.root.size: B to GB
disk.ephemeral.size: B to GB

Change-Id: I59599c2cb7df02acc0d4349a8591a2c1bda4f9ec
(cherry picked from commit b101e0f6d91c391de4ae54080ee9e73465051543)
Restore default interval

As we switched to multi-publisher pipelining, we modified,
I believe by mistake, the default polling interval from 600
to 60 second.

Change-Id: I4192a52aab1cbb744cd7ddf212e5ed3b0a3a27e6
Fixes: bug #1181153
(cherry picked from commit c48284bdd4bcaac975f98b8f0ff89f059a910480)
Document HBase configuration

The instructions to configure HBase as the database backend for Ceilometer

Change-Id: I3c79e68db7226531d77037bc93ca2cca3ef7db28
Fixes: bug #1174326
(cherry picked from commit 018e39df1a549986f2c2cb241614e3c4e93650cd)
Merge "Restore default interval" into stable/grizzly
Merge "Document HBase configuration" into stable/grizzly
Merge "fix compute units in measurement doc" into stable/grizzly