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 '# '

Note: These errors do not appear when using the default `pep8` package on Ubuntu 12.04. This seems to be due to the version difference (0.6.1 vs ~1.5.0). See below.

<pre>
$ pep8 --version
0.6.1
$ pep8 zpmlib
[no output]
</pre>

Using the latest `pep8` binary installed into the tox environment, I see this:

<pre>
$ .tox/pep8/bin/pep8 --version
1.5.0
$ .tox/pep8/bin/pep8 zpmlib
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 '# '
</pre>