make_deb.py errors on python 2

[cryslith]

It seems that the recent change to fix flag encoding on python3 breaks on python2, since os.fsencode doesn't exist.

rules_pkg/pkg/make_deb.py

Line 343 in 96e34ab

flagvalue = os.fsencode(flagvalue).decode('utf-8')

  File "[...]/bazel-out/host/bin/external/rules_pkg/make_deb.runfiles/rules_pkg/make_deb.py", line 397, in <module>
    main(FLAGS(sys.argv))
  File "[...]/bazel-out/host/bin/external/rules_pkg/make_deb.runfiles/rules_pkg/make_deb.py", line 370, in main
    description=GetFlagValue(FLAGS.description),
  File "[...]/bazel-out/host/bin/external/rules_pkg/make_deb.runfiles/rules_pkg/make_deb.py", line 343, in GetFlagValue
    flagvalue = os.fsencode(flagvalue).decode('utf-8')
AttributeError: 'module' object has no attribute 'fsencode'

[aiuto]

What invocation are you doing to use Python2? Are you forcing something on the command line, or do you not have a Python 3 environment at all.

We are actively trying to move to Python 3 for all this code, so I want to understand the need for the backwards compatibility.

[aiuto]

We are now more actively discontinuing python2.