treewide trailing whitespace cleanup

treewide trailing whitespace cleanup

generated by: find . -name '*.pm' -exec sed -i 's/\s*$//g' {} \;

As I touched almost any file here anyway I'm not scared to appear in
git blame ;-) also it has support to suppress whitespace changes.

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>