clean up license headers

This removes extraneous whitespace, applies a consistent licensing
header to all files, removes "all rights reserved" lines attributed to
the OpenStack Foundation, removes authorship lines for Matt Rutkowski
(which the git commit history much more accurately conveys) and follows
all licenses with a blank line before the code/docstr begins.

Change-Id: Idcfefd923e5ddb574087265c998dd50ebfe70a79
Merge "clean up license headers"