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
  
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I met some issues when running the cases in the same level of describe under node 0.8.28. The mocked response data matched with wrong case sometimes. It's repro-ed on nodejs 0.8.28 only.