[Windows] Add Azure CI file and fixing test breaks on Windows

[seanyen]

This change is to add Azure DevOps pipelines for running Windows CI, and also fixes test breaks on Windows:

Highlight the changes on the production code side:

• src/rosdep2/platforms/source.py
  • add missing tarfile.close()
• src/rosdep2/shell_utils.py
  • add script suffix .bat on Windows to make the shell able to run the script.
• src/rosdep2/main.py
  • fix missing os.EX_USAGE on Windows causing runtime errors.
  • use portable os.pathsep to replace :
• src/rosdep2/platforms/windows.py & src/rosdep2/__init__.py
  • Add stub rosdep2.platforms.windows to avoid Unsupported OS error on Windows.
• src/rosdep2/installers.py
  • conditionally add 'sudo -H' based on availability of os.geteuid().

Summary of changes on the test code side:

• Fix test cases to accommodate the sudo -H changes.
• Normalize file:// URIs in test cases.
• Conditionally generate test script for bash scripts and batch scripts.
• Add missing mock function for test_RosdepInstaller_install_resolved
• Add alternative implementation for os.path.samefile for Python 2 on Windows.

[seanyen]

Azure CI result is published here: https://ros-win.visualstudio.com/ros-win/_build/results?buildId=3150

[codecov-io]

Codecov Report

Attention: Patch coverage is 93.33333% with 3 lines in your changes missing coverage. Please review.

Project coverage is 76.51%. Comparing base (f771260) to head (1e066a5).
Report is 113 commits behind head on master.

Files with missing lines	Patch %	Lines
src/rosdep2/shell_utils.py	92.59%	2 Missing ⚠️
src/rosdep2/main.py	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #661      +/-   ##
==========================================
+ Coverage   75.99%   76.51%   +0.51%     
==========================================
  Files          40       41       +1     
  Lines        3129     3330     +201     
==========================================
+ Hits         2378     2548     +170     
- Misses        751      782      +31     

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[seanyen]

@nuclearsandwich Just a friendly ping. This is a PR focused on fixing test failures for rosdep on Windows. Let me know anything to iterate.

[tfoote]

Overall this looks good to me. Though I saw that there were some places to reduce the size of the diff/additional code for better long term maintenance.

I'm a little surprised that the sudo commands were necessary to adjust for windows as in the unit tests I expect them to not be executed and just be string matching, but I think this is an improvement so we might as well use it.

[seanyen]

@tfoote @nuclearsandwich I pushed new changes to address the duplicate logic feedbacks and rebase the code to the latest master. And the results are green for Windows CI: https://ros-win.visualstudio.com/ros-win/_build/results?buildId=4336

Hope you can take a look for the new iteration! Thanks!

[seanyen]

@cottsay @tfoote @nuclearsandwich Please excuse me to ping you all. Hope this is still under the radar and it would be nice to see more Windows support for rosdep.

[seanyen]

travis seemed to fail on a infrastructure issue:

Homebrew must be run under Ruby 2.6! You're running 2.3.3. 

[nuclearsandwich]

@seanyen now that #751 is finally merged would you like to rework this PR to add Windows CI via GitHub Action?