Removed unused verification of supported commands

[rodcloutier]

I noticed that the cli.py module coverage was not reported as complete the but the tests seemed to be fine, testing all cases. I noticed that a verification of supported commands was hit by the tests hence the tests succeeding but the coverage not full.

I removed the verification code since the command option uses a choice which will report any unsupported commands.

Test run before

$ tox -e py27 --develop
py27 develop-inst-noop: /Users/rod/dev/external/twine
py27 runtests: PYTHONHASHSEED='992522251'
py27 runtests: commands[0] | coverage run --source twine -m pytest tests
========================================================= test session starts =========================================================
platform darwin -- Python 2.7.6 -- py-1.4.26 -- pytest-2.7.0
rootdir: /Users/rod/dev/external/twine, inifile:
collected 15 items

tests/test_cli.py ..
tests/test_upload.py .....
tests/test_utils.py ........

====================================================== 15 passed in 0.30 seconds ======================================================
py27 runtests: commands[1] | coverage report -m
Name                      Stmts   Miss Branch BrMiss  Cover   Missing
---------------------------------------------------------------------
twine/__init__               11      0      0      0   100%
twine/cli                    27      2      4      2    87%   67-68
twine/commands/__init__       2      0      0      0   100%
twine/commands/upload       103     66     34     26    33%   26-27, 84-218, 222-275
twine/utils                  45      1     27      2    96%   29
twine/wheel                  47     30      8      8    31%   23-24, 44-46, 50-51, 54-78, 81-85
twine/wininst                37     26     10     10    23%   16-18, 22-26, 29-54
---------------------------------------------------------------------
TOTAL                       272    125     83     48    51%
_______________________________________________________________ summary _______________________________________________________________
  py27: commands succeeded
  congratulations :)

Test run after

 $ tox -e py27 --develop
py27 develop-inst-noop: /Users/rod/dev/external/twine
py27 runtests: PYTHONHASHSEED='1904517968'
py27 runtests: commands[0] | coverage run --source twine -m pytest tests
========================================================= test session starts =========================================================
platform darwin -- Python 2.7.6 -- py-1.4.26 -- pytest-2.7.0
rootdir: /Users/rod/dev/external/twine, inifile:
collected 15 items

tests/test_cli.py ..
tests/test_upload.py .....
tests/test_utils.py ........

====================================================== 15 passed in 0.30 seconds ======================================================
py27 runtests: commands[1] | coverage report -m
Name                      Stmts   Miss Branch BrMiss  Cover   Missing
---------------------------------------------------------------------
twine/__init__               11      0      0      0   100%
twine/cli                    22      0      2      0   100%
twine/commands/__init__       2      0      0      0   100%
twine/commands/upload       103     66     34     26    33%   26-27, 84-218, 222-275
twine/utils                  45      1     27      2    96%   29
twine/wheel                  47     30      8      8    31%   23-24, 44-46, 50-51, 54-78, 81-85
twine/wininst                37     26     10     10    23%   16-18, 22-26, 29-54
---------------------------------------------------------------------
TOTAL                       267    123     81     46    51%
_______________________________________________________________ summary _______________________________________________________________
  py27: commands succeeded
  congratulations :)

[sigmavirus24]

LGTM. Thanks @rodcloutier