03255001d6 moved commands module to src/tito/compat.py to handle
differences between python2 and python3, but missed a bit that
did not show up in unit or functional tests.
Fix those occurences and add unit test to detect the regression.
python3 does not allow relative imports.
test/unit/__init.py__ and test/functional/__init.py__ already exist,
which means we can use absolute import on all versions of python
without resorting to http://legacy.python.org/dev/peps/pep-0328/
Python 3 does not have the print statement, so convert all
print statements to print functions and add an ugly duckling
unit test to detect regressions.
Add modules compat lib to support both python 2 and 3, and
add unit test to detect regressions.
Tito uses two modules that have changed significantly between
python 2 and 3:
* commands module merged into subprocess module
* ConfigParser module renamed as configparser
Exceptions are now compatible with both python 2.4 and 3.3,
and we have unit tests to detect regressions.
The syntax for capturing exceptions changed in python 3, but
we need to continue supporting python 2.4 syntax since many
people use tito on RHEL 5, which has python 2.4.
http://docs.python.org/dev/howto/pyporting.html#capturing-the-currently-raised-exception
These are the pep8 tests that break python3,
such as mixing tabs and spaces for indentation.
I ignored all the pep8 tests that seemed only stylistic,
such as "visual" indentation.
http://docs.python.org/3.3/reference/lexical_analysis.html
