Removes trailing whitespace

A number of files contained trailing whitespace, this has been removed
with the following perl one-liner.

perl -pi -e 's/ +$//' *

Not having whitespace prevents confusing diff outputs such as the
following.

https://github.com/jhoblitt/puppet-ganglia/pull/3#discussion-diff-7579522
Merge pull request #20 from george-b/whitespace_removal

Removes trailing whitespace