Added the logic to validate HPA

Added the code logic to validate HPA for opnfv tosca parser. Also
corrected some hpa validation schema errors introduced by the previous
patch.

Change-Id: Icd61d34d7915aa965ec32adfc3c0f1a117dd6f3e
Issue-ID: VNFSDK-194
Signed-off-by: Lianhao Lu <lianhao.lu@intel.com>
5 files changed