tools: add tool for pep8 reformatting

This calls the PEP8 linter called autopep8:

https://github.com/hhatto/autopep8

So we can make autotest to fully adhere to PEP8,
since there's a tool that can enforce the standard.

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>
Signed-off-by: yangdongsheng <yangds.fnst@cn.fujitsu.com>
tools: add pep8 check into check_patch

Integrate the PEP8 linter into the virt-test full
tree and patch verification process. It works by
verifying whether the PEP8 linter modified the file in
place, if it did, it means there are non compliances
in the code.

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>
Signed-off-by: yangdongsheng <yangds.fnst@cn.fujitsu.com>
tools: Add codespell

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>
tools: Sync PEP8 and check_patch scripts with virt-test

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>
PEP8 mass fixes

With the help of the PEP8 script, a semi-automated clean
of the code base was made, and effectively changing some
of the coding style rules of our code base:

 * No more 2 lines spacing among functions
 * No more combined module imports

In the end, it was going to be too difficult to take
into consideration E501 (line length > 80) errors and
W601 (.has_key() is deprecated), so these were ignored,
at least for now.

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>
Mass docstring fix

Make virt-test to have a docstring style mostly compliant with
the sphinx's [1] format, reStructured text. This means that
we have to trade all '@' tags to be ':', mostly.

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>
unittests: Fixing broken unittests with latest refactors

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>
CODING_STYLE: Update document reflecting the move to PEP8

While our base coding style was already PEP8, we had some
differences, such as 2 lines separating functions, and
single line imports. This made hard to automatically
enforce coding style rules other than review.

Given the incentives to move closer to the PEP8, we
decided to go forward with the plan, so the coding
style document has to be updated accordingly.

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>