Add support for TOSCA policies

Add support for TOSCA policies in particular basic "Placement" policies depending upon spec work for version 1 of specs.

Policies typically address few major areas of concern for customer workloads:
• Access Control – assures user and service access to controlled resources are governed by rules which determine general access permission (i.e., allow or deny) and conditional access dependent on other considerations (e.g., organization role, time of day, geographic location, etc.).
• Placement – assures affinity (or anti-affinity) of deployed applications and their resources; that is, what is allowed to be placed where within a Cloud provider’s infrastructure.
• Quality-of-Service (and continuity) - assures performance of software components (perhaps captured as quantifiable, measure components within an SLA) along with consideration for scaling and failover.

Please refer to the spec for more detail.