Port option/ to python3

[ghthor]

Followup for #6062. Almost all automated changes, the the exception of the change from using map() to a for loop.

[stuhood]

Thanks!

[stuhood]

@ghthor : Looks like there is a lint issue: recommend using build-support/bin/pre-commit.sh before pushing (or installing them as commit hooks with build-support/bin/setup.sh and then skipping with git commit -n .. if need be)

[ghthor]

@stuhood noted. I'll do that and update.

[ghthor]

Ok, fixed the linting issues. Looks like a test failure[1][2] due to underlying type changes used for comparisons. @Eric-Arellano Does this make sense within the context of what's happening?

[1] https://travis-ci.org/pantsbuild/pants/jobs/404468884#L5273
[2] https://travis-ci.org/pantsbuild/pants/jobs/404468885#L5120

[Eric-Arellano]

@ghthor you can fix the test by adding str to the import on line 9 of options.py.

The reason that test is failing is that test_options.py is using the backported str, whereas options.py is still using the Python2 version of str, so the types aren't matching up correctly.

[stuhood]

Thanks!