Clean up import statements

[pgombar]

Description

Unpack import * and clean up imports (sort alphabetically, remove unused).

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PR information

• The title of the PR is clear and informative.
• There are a small number of commits, each of which has an informative message. This means that previously merged commits do not appear in the history of the PR. For information on cleaning up the commits in your pull request, see this page.
• Except for special cases involving multiple contributors, the PR is started from a fork of the main repository, not a branch.
• If applicable, the PR references the bug/issue that it fixes in the description.
• New Unit tests were added for the changes made and Travis.CI is passing.

Quality of Code and Contribution Guidelines

• I have read the contribution guidelines.

[larohra]

Thanks a lot for this change, our small step towards a cleaner healthier code :)
Just make sure to get a greeen DCR run before merging :)

[codecov]

Codecov Report

Merging #1900 into develop will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           develop    #1900   +/-   ##
========================================
  Coverage    69.42%   69.42%           
========================================
  Files           85       85           
  Lines        11788    11789    +1     
  Branches      1653     1653           
========================================
+ Hits          8184     8185    +1     
  Misses        3239     3239           
  Partials       365      365           

Impacted Files	Coverage Δ
azurelinuxagent/common/osutil/factory.py	97.29% <100.00%> (ø)
azurelinuxagent/common/protocol/goal_state.py	93.81% <100.00%> (+0.02%)	⬆️
azurelinuxagent/common/protocol/wire.py	77.00% <100.00%> (ø)

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