cherokee: fix the installed but not shipped issue

We will get the following ERROR/WARN if we enable the
installed-vs-shipped check in QA:

ERROR: QA Issue: cherokee: Files/directories were installed but not shipped
  /srv
  /srv/www
  /srv/www/htdocs
  /srv/www/htdocs/index.html
  /srv/www/htdocs/images
  /srv/www/htdocs/images/cherokee-logo.png
  /srv/www/htdocs/images/default-bg.png
  /srv/www/htdocs/images/favicon.ico
  /srv/www/htdocs/images/powered_by_cherokee.png

I think that we can pack these files into cherokee just like what
apache2 does.

Fedora 17 also packs them

Signed-off-by: Robert Yang <liezhi.yang@windriver.com>