Update python-ceilometerclient lower bound to 1.0.6

Corresponding global-requirements change proposed here:

  https://review.openstack.org/49696

Change-Id: Ibc41db3ca2651711dbe9e68f33441a0f1467f9e7
Changes FakeMemcache to set token to expire on utcnow + 5 mins

fixes bug 1240994

keystoneclient 0.4 will use utcnow to compare expiration date.
The FakMemcache class sets expiration to datetime.now which sets
date for local timezone. If this timezone happens to be behind
utc the test will fail with expiration error because we are
comparing utc + 5 mins with utc - 1 or more hours.

Change-Id: I551506a5aaf0aef77476b11786399a66225603bf
Merge "Changes FakeMemcache to set token to expire on utcnow + 5 mins"
Merge "Update python-ceilometerclient lower bound to 1.0.6"