/distribution/beaker/dogfood: upload server-errors.log after test run

Change-Id: Iac939d3ccc3c7ef139bc5d38a698fb03fac601de
tests: hack to fix permissions issues on /var/www/beaker/rpms/repodata

Change-Id: I9a60548798595ebde907eb02a31df2a051c96ae5
tests: fix LC FQDN usage when proxy tests run in dogfood

Change-Id: I56d08745922973994f084d2e2b5b345f4e2cbc23
/distribution/beaker/dogfood: reduce number of Apache worker processes

The dogfood task requires a lot of memory and will swap on any box with
<2GB. Most of that is unavoidable but we can reduce memory pressure
a bit by cutting down on Apache worker processes.

Change-Id: I3df240f0ae866b029f2841af4137c9ccd631e0f0