Acore-server-metadata

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**Miscellaneous**

- upgrade dependencies.
- improve internal implementation.

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**Features and Improvements**

- add the following public API:
- ``acore_server_metadata.api.Server.from_ec2_inside``
- ``acore_server_metadata.api.get_boto_ses_from_ec2_inside``

**Miscellaneous**

- upgrade dependencies.

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**Minor Improvements**

- ``acore_server_metadata.settings`` module is not in used anymore. It is kept for backward compatibility. Now we use `acore_constants <https://github.com/MacHu-GWU/acore_constants-project>`_ library to define constants.

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**Features and Improvements**

- Now the ``acore_server_metadata.api.Server.get_server()`` method will always return a ``Server`` object. If the ec2 or rds doesn't not exists, then the ``ec2_inst`` or ``rds_inst`` attribure of the ``Server`` object will be ``None``. This behavior was returning ``None`` before.
- Similarly the ``acore_server_metadata.api.Server.batch_get_server()`` method will always return a ``Server`` object for specific id.

**Minor Improvements**

- add many unit test to cover the server operations API.

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**Bugfixes**

- fix a bug when "check=True", we didn't use the object representing the latest ec2 or rds metadata.

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**Minor Improvements**

- ``acore_server_metadata.api.Server.run_rds`` now also copy ``tech:master_password_digest`` tag from snapshot to RDS instance.