Enable H904: wrapping using parantheses

Enabled H904 on tox and changes made in relevant files to adhere to H904
guideline. Backlash based line wrapping modified to use bracket based or quote
based wrapping mechanism with modified indentations.

Change-Id: I10b1ce7fbc230ff3167adbb06e0982b4cc0b0bb7
Closes-Bug: #1398555