Support creating SAS for Azure stoage services

1. Support new commands
   * azure storage container sas create
   * azure storage blob sas create
   * azure storage table sas create
   * azure storage queue sas create
2. Fix bugs: some of storage unit tests cannot be run live
  
<!---@tfsbridge:{"tfsId":2307430}-->
If policy parameter actually contains the policy ID, not a policy object, it should probably be named `policyId` instead so that it's obvious what this is.