commands: remove some commented-out code

This removes some commented-out code, which appears to have been only
for debugging. This code was also causing pep8 errors with later
versions (v1.5-ish) of pep8. The errors I saw when running `tox -e pep8`
were as follows:

zpmlib/commands.py:145:5: E265 block comment should start with '# '
zpmlib/commands.py:146:5: E265 block comment should start with '# '
zpmlib/commands.py:147:5: E265 block comment should start with '# '
Merge pull request #61 from larsbutler/remove-commented-code

commands: remove some commented-out code