engine : add suspend/resume support to watch resource

Add suspend/resume support to CloudWatchAlarm resource and
underlying watchrule - this means that when in suspended
state watches will not allow new metric data to be added
or for alarm evaluation/actions to happen

blueprint stack-suspend-resume

Change-Id: Ic9a1c1bd86ac8156f260791089a38889eabc6528
engine : add suspend/resume support to User resource

When a User resource is in suspended state, disable the keystone
user owned by the resource

blueprint stack-suspend-resume

Change-Id: Iee8dddcfbc0fc9bd132ddfadd2a17eb1b0894f51
Merge "engine : add suspend/resume support to watch resource"
Merge "engine : add suspend/resume support to User resource"