read_wfMsgCalls.py wrap long line, kill w/s

Passing pep8 on the read_wfMsgCalls raises a lot of issues. This patch:
* removes the trailing whitespaces
* kill multiple blank lines
* rewrap overlong comments

Change-Id: I5d0ffbc552a9f2f519eb3ad71d8a839f2b941cdf
vim modeline for read_wfMsgCalls.py

The script uses tabs for indentation. This patch adds a vim modeline to
prevents the editor from converting tabs to spaces.

Change-Id: I0369ea982ec48f4d87e2bab1c03a1f522536e93e