VMware:Update the ceilometer doc with VMware opts

Currently the ceilometer doc does not contain the details
of VMware opts.
This patch adds the VMware opts details to the doc.

Closes-bug: #1326807
Change-Id: I3511f60ece357fe5dbf7d794e0d31307a4565b8b
Merge "VMware:Update the ceilometer doc with VMware opts"