Update heat and ceilometer clients requirements

Current minimal versions of python-keystoneclient and python-ceilometerclient
require an incompatible version of python-keystoneclient (>=0.2,<0.3)

As a result, setuptools will fail to install horizon if python-heatclient-0.2.2
and/or python-ceilometerclient-1.0.1 are installed

This patch updates the mimimal versions of these client to make sure they have a
compatible requirement of python-keystoneclient (>=0.3.0)

Change-Id: Id5dc6bb4514ebb98496ae08aa633c0b71d886f3f
Fixes: bug #1199529
Merge "Update heat and ceilometer clients requirements"