Add testcase for multiple discovery-driven sources

This test was intended to reproduce the reported issue around
resources discovered for one pollster bleeding into the resource
list passed to an unrelated pollster with the same interval.

However the observed behaviour seems correct.

Related-bug: #1335986
Change-Id: Ifb608246ad2ee2d858b4268ae2e8dc6faaff025c
Remove redudent space in doc string

In file ceilometer/compute/plugin.py, there are some redudent
spaces, the patch will remove them and make the code more pleasure:)

Change-Id: I1a896366bab3344422d905b30b24cbb8f257ddde
Automatic discovery of TripleO Overcloud hardware

-geting IP addresses from Undercloud nova, allowing
 to poll all Overcloud nodes via SNMP
-adding support of basic auth, user_name and password
 used in TripleO by default

Change-Id: I189dbba9579055c8a1a878a769760a72e9174c6d
Enable some tests against py33

Change-Id: Ibaf141784cbe08230cdb8f9aba3e5f376e7e1b93
Add cumulative and gauge to aggregator transformer

Currently, the aggregator transformer just sums up the volumes of all
aggregated samples.

This patch improves it so it returns just the latest volume for cumulative
meters and the average of volumes for gauge meters.

DocImpact: Aggregator transformer now works for gauge and cumulative as well
Change-Id: I172a7298dc063ff36b2a209df25d6650debb5a14
Closes-bug: #1342668
Merge "Automatic discovery of TripleO Overcloud hardware"
Merge "Enable some tests against py33"
Merge "Remove redudent space in doc string"
Merge "Add testcase for multiple discovery-driven sources"
Merge "Add cumulative and gauge to aggregator transformer"