bugzilla: remove SSL Apache config for old-bz

to put behind misc-web varnish we need to
adjust the Apache config on the backend.

remove SSL part and change RewriteCond to be
based on X-Forwarded-Proto

keep bug-attachment unchanged

Change-Id: I3ce54f7d59efade97f0449f5f13380bab9d3cb96
Merge "bugzilla: remove SSL Apache config for old-bz" into production