tests: remove date from @author docs statements

phpunit interprets '@author' documentation statements to generate group.
Appending the year to the author name created duplicates entry:

 $ php phpunit.php --list-groups|grep Antoine
 Antoine Musso
 Antoine Musso, 2012
 $

Removing the date fix the duplication. I have also inserted
corresponding '@copyright' statements.

Change-Id: I65b19adb59c4894314ce68a0c815c5d3e4c30df0
Merge "tests: remove date from @author docs statements"