Replace mongo shell interaction with script

In the section of 'Install the Telemetry service', we need to create
the database and a ceilometer database user. Currently we use mongo
shell and require user to interact with it. However, we can use
mongo script and do it via single copy and paste.

Change-Id: I6b88f920c9576aabdc190affc807a0f566ee4c5e
Merge "Replace mongo shell interaction with script"