Capture apache configuration files

Capture the apache vhost files in the output from ds-g. Since we
have more than just horizon's configuration, it is useful to know
how the Apache server is running / errors in the vhost when a
check or gate job finishes.

Change-Id: I1e5a7b5086566c0cbd18dee92c5062773ce8a8e5
Merge "Capture apache configuration files"