Use strings for block device mapping info

Nova client receives colon separated strings for block device mapping info
instead of a list.

Fixes bug #1221693

Change-Id: I321001d406f620d5f8a21e0f28cf706579ad64ad
Validate OS::Nova::Server block_device_mapping property

Make sure either volume_id or snapshot_id exists but not both. Also this patch
ensures that a bootable volume is specified when image is not given.

Fixes bug #1215267

Change-Id: Ia51f6c7aec9c0b257318992ee58febc392ea3d84
assertEquals is deprecated, use assertEqual

Change-Id: If77b02e69d01e02db03ccb8613dcc327eb2844db
Document ceilometer alarm properties

This adds descriptions to the properties of OS::Ceilometer::Alarm.

Change-Id: I3851c8785c0bd94aae6412e75a02ee98ce13478b
Closes-Bug: #1224162
Fix misused assertTrue in unit tests

Refactored unit tests to use assertEqual instead of assertTrue
where needed.

Fixes bug #1226374

Change-Id: I6826fefbb7c6fed8b0e664da36b144e882fb6d0e
Merge "Fix misused assertTrue in unit tests"
Merge "assertEquals is deprecated, use assertEqual"
Merge "Document ceilometer alarm properties"
Merge "Use strings for block device mapping info"
Merge "Validate OS::Nova::Server block_device_mapping property"