Add security group rule templates

Add a variety of common port mappings in a dropdown to help
users add security rules.

Change-Id: If7422c21eae56580f0fc2403cb08ba25655a73a4
Implements: blueprint security-group-rule-templates
Adding pagination to the tenant views

Modifying the api.keystone.tenants_list() method by setting
limit/marker parameters to handle pagination.

Change-Id: Ice67a6112ed8b90095e9c9991bee3e715c22ec01
Fixes: bug #904003
Merge "Add security group rule templates"
Merge "Adding pagination to the tenant views"