[tripleo-common] UpdateRoles workflow

Provide an UpdateRoles workflow to update Roles. It takes data in json format validates its contents and persists them in roles_data.yaml, after successful update, templates are regenerated.

input: containerName, [array of roles in json to update in json]

1) validate the format of input (verify that each role in input has the required attributes set. check README in roles directory in t-h-t), validate that roles in input exist in roles directory in t-h-t
2) validate that Network names assigned to Role exist in network-data.yaml object in Swift container
3) update roles_data.yaml object in Swift with roles from workflow input
4) regenerate templates
5) run ListRolesAction to get updated contents of roles_data.yaml and provide it as output

output: contents of roles_data.yaml in json format