python: Fix trailing spaces in package versions

[Forty-Bot]

These extra spaces cause errors like warning: cannot resolve "python-requests " or warning: cannot resolve "python-flask >= 2.0" when converting python to pacman

Closes: #1858

[Forty-Bot]

Hi, @jordansissel do you have any comments on this PR? Can it be merged?

[jordansissel]

Hi! Thanks for helping make fpm better :)

This PR causes 6 new test failures, all of which seem directly related to this change and the fact that most of the tests seem to expect the extra spaces. I'll take a look and see if these are easy to fix.

[jordansissel]

Beyond the test failures, it seems to actually cause fpm to create bad deb packages. I haven't dug further, but here's what I know:

Test case: fpm -f --python-bin python3 -s python -t deb requests

Looking at the Depends entry in the resulting python package:

• main branch: Depends: python-urllib3 (<< 1.27), python-urllib3 (>= 1.21.1), python-certifi (>= 2017.4.17), python-charset-normalizer (= 2.0.0), python-idna (<< 4), python-idna (>= 2.5)
• This PR: Depends: python-urllib3>=1.21.1, python-urllib3<1.27, python-certifi>=2017.4.17, python-charset-normalizer=2.0.0, python-idna>=2.5, python-idna<4

This PR seems to cause the python->debian package conversion to work incorrectly as the deb.rb's converted_from doesn't seem to yet understand a dependency string without spaces.

[Forty-Bot]

This PR causes 6 new test failures, all of which seem directly related to this change and the fact that most of the tests seem to expect the extra spaces. I'll take a look and see if these are easy to fix.

How do I run tests? I had a look through your docs but I didn't see anything.

I've pushed a new version which should hopefully work better. Instead of removing spaces outright, instead strip excess spaces. This should preserve spaces for debian packages.