Add ceilometerclient and bootstrap-datepicker as dependency.

Add python-ceilometerclient to the requirements.txt file
since ceilometer api depends on it.
Add bootstrap-datepicker to select date.

Implements: blueprint ceilometer

Change-Id: Ifd9c9240c770bea3304dae83d6abc79e7580a234
Merge "Add ceilometerclient and bootstrap-datepicker as dependency."