Remove Copyright holder line from template

The important part is the Apache2 header not who holds the copyright.
These copyright holder lines are often inaccurate and misleading, so
don't require one by default.

Note: Some companies require there employees to use these, so if someone
adds this line in there spec, we should allow it. We just don't want to
require one by default.

Change-Id: Ifd82752d4e220360ab1d8a6bcd3fc27cb10b7d65