apache2: fix host-user-contaminated warnings

It shows warnings when build apache2 such as:

| WARNING: QA Issue: apache2: /apache2-dev/usr/share/apache2/icons/small/movie.gif
| is owned by uid 1785, which is the same as the user running bitbake.
| This may be due to host contamination [host-user-contaminated]

Set the owner and group to root to fix it.

Signed-off-by: Kai Kang <kai.kang@windriver.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Armin Kuster <akuster808@gmail.com>