When you are writing a multiple method invocation (or other similar
syntax)
```
obj.method(argument1,
argument2,
...)
```
If you put argument1 in the first line, the following lines should have
the same hanging distance to argument1.
If you put argument1 in the second line, the hanging distance should
always be four.
```
obj.method(
argument1,
argument2,
...
)
```
Otherwise PEP8 would complain for continuation line under/over indented
problems. See below for more details
https://www.python.org/dev/peps/pep-0008/#indentation
This patch fixes all the continuation line indentation problems and
enables related checks in tox.ini.
Closes-bug: #1459514
Change-Id: I80995c2ae71b817ad78a87ab7c567f0d36112710