Remove unused method and variable in base.py

base.py was migrated and simplified by
 commit: 45da2a78dc9d560b021ae3fa90d9b7e45b6c9b51
But there are some unused codes in it. This commit just removes them.

Change-Id: Ie16fdf75b69006cf48ad9b2649c4bf3659901b80
Remove a duplicate ignore rule of pep8

There are two E123 declarations in tox.ini. However, we don't need the
duplication. This commit removes one.

Change-Id: I9e681b99b8b6df84ae986974ac733a380e127605
Merge "Remove unused method and variable in base.py"
Don't edit commit history with migrate from tempest tool

This commit changes the migrate_from_tempest tool to not mess around
with the commit history. The previous approach in the tool isn't
actually something that we can do. The commit history we had when the
repository was created is the canonical past for tempest-lib and we
can't migrate over any other tempest commits directly, this was a
mistake on my part.

Moving forward we'll just have to refer to the commit sha1s from the
tempest repo in the commit message. This script will now just copy the
specified files from tempest and generate a commit message with the
complete list of sha1s from the tempest history.

Change-Id: I7e2b2a0543d113961598b33d23985a1082fbba9a
Merge "Don't edit commit history with migrate from tempest tool"