devel/py-gitosis: Update to 0.3 and limit to Python 2.7

[kai]

Summary

The package is not compatible with Python 3 and emits errors like:

2352, in resolve

  module = __import__(self.module_name, fromlist=['__name__'], level=0)
File "/usr/local/lib/python3.6/site-packages/gitosis/serve.py", line 142
  util.mkdir(p, 0750)

While I'm here:

• Add location to license file
• Update URL in pkg-message
• Add test target with the required dependencies
• Pet portlint

Changelog:

https://github.com/tv42/gitosis/releases/tag/release%2F0.3

PR: 235441 [1], 235894 [2]
Reported by: Dan McGrath [1]
Submitted by: Keith Gaughan [2]
Approved by: (one of the mentors), maintainer timeout (> ~25 days) [1], maintainer [2]

Test Plan

• poudriere (11.2-, 12.0-RELEASE, 13.0-CURRENT@r344112 amd64 + i386) -> OK
• portlint -> OK
• Tests using devel/py-pytest -> OK with py27, 9 Errors with py36

Excerpt of errors with py36:

ImportError while importing test module '/wrkdirs/usr/ports/devel/py-gitosis/work-py36/gitosis-release-0.3/gitosis/test/test_ssh.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
gitosis/test/test_ssh.py:4: in <module>

from cStringIO import StringIO

E ModuleNotFoundError: No module named 'cStringIO'

/usr/local/lib/python3.6/site-packages/_pytest/python.py:468: in _importtestmodule

mod = self.fspath.pyimport(ensuresyspath=importmode)

/usr/local/lib/python3.6/site-packages/py/_path/local.py:701: in pyimport

__import__(modname)

E File "/wrkdirs/usr/ports/devel/py-gitosis/work-py36/gitosis-release-0.3/gitosis/test/test_serve.py", line 357
E util.check_mode(foo, 0750, is_dir=True)
E ^
E SyntaxError: invalid token

[kai]

Forgot to add files/patch-setup.py

[miwi]

LGTM