factored out parse_args from main

[zyxue]

to be more modular

[axsaucedo]

/test integration

[seldondev]

@zyxue: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
integration	fb4c046	link	/test integration

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[axsaucedo]

The failing tests are only from flaky ones so we can move ahead with merge - thanks @zyxue
/approve

[seldondev]

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This pull-request has been approved by: axsaucedo

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