chore(sdk): Import mock from stdlib and drop dependency.

[jmcarp]

Description of your changes:

I noticed that we're installing mock, which is now available in the stdlib. This patch drops the mock dependency and imports it from unittest.

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[NikeNano]

/ok-to-test

[NikeNano]

Do the current version of unittest used needs to be updated to allow this @jmcarp?

[jmcarp]

I don't think so @NikeNano. The unittest package is part of the standard library, and it's included mock since python 3.3. We're already using it in many of the tests, just not all of them.

[chensun]

Thanks @jmcarp

Can you also remove it from here:

pipelines/sdk/python/requirements-test.txt

Line 2 in e45782e

mock==3.0.5

[chensun]

/ok-to-test

[chensun]

/lgtm
/approve

[google-oss-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: chensun

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[chensun]

/retest