Add support for suspend/resume actions

Adds support for action-suspend and action-resume

blueprint stack-suspend-resume

Change-Id: If82e6b19756d3eae8a379141ae1f25565895e262
Unit tests for pretty table special formatters.

Change-Id: If07b4a5fc0c4ae2eecf486433134864270757945
Format resource required_by in resource-show.

This change has no effect if the resource details contains
no requires key (such as for older API versions).

Change-Id: I5bce5cf6a7c7cd3f531453cd126fb7b7b3e227ef
Merge "Unit tests for pretty table special formatters."
Merge "Format resource required_by in resource-show."