Use flask_script since flask.ext.script is deprecated (in admin.py)

[xuhang57]

Change to flask_script based on the CLI prompt saying flask.ext.script is deprecated.

(.venv) ➜ ubuntu@hil-dev  ~/hil git:(master) hil-admin db create
/home/ubuntu/hil/hil/commands/admin.py:7: ExtDeprecationWarning: Importing flask.ext.script is deprecated, use flask_script instead.
  from flask.ext.script import Manager
DEBUG:passlib.registry:registered 'sha512_crypt' handler: <class 'passlib.handlers.sha2_crypt.sha512_crypt'>

Similiar to https://github.com/CCI-MOC/hil/pull/981

[coveralls]

Pull Request Test Coverage Report for Build 1765

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 59.696%

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Totals
Change from base Build 1762:	0.0%
Covered Lines:	2124
Relevant Lines:	3558

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💛 - Coveralls

[naved001]

Strange, I grepped for it before raising my pr and didn't see this. Sigh. Can you double check that we don't have this anywhere else in the code?

[xuhang57]

@naved001 sure, you didn't find it because this is the script not the sqlalchemy ;)

[xuhang57]

This is the only place I found

[zenhack]

LGTM, merging.