CloudFormation create/delete stack resource polling - EUCA-10147

Resource create/delete are now checked by polling the resource instead
of using retries. Actions now expose a timeout for steps rather than a
retry policy. A WorkflowUtils class is added to simpleworkflow common so
generic workflow logic can be reused.

EUCA-10147
CloudFormation create stack monitoring polling - EUCA-10146

The create stack monitoring workflow now uses polling to check for
workflow completion rather than activity retries.

EUCA-10146
CloudFormation polling times adjusted - EUCA-10146 EUCA-10147
Merge remote-tracking branch 'origin/dev/sjones/EUCA-10147' into testing

Conflicts:
	clc/modules/imaging-common/src/main/java/com/eucalyptus/imaging/ImagingServiceProperties.java
	clc/modules/loadbalancing-backend/src/main/java/com/eucalyptus/loadbalancing/activities/LoadBalancerASGroupCreator.java