Remove the wholesale collection of HTTP headers since in general
they cannot be trusted, but retain the selected capture of specific
HTTP headers configured by an admin.

These changes were supposed to have been part of commit 0c20dce but
due to a mistake they were inadvertantly omitted. This finishes the
intent of commit 0c20dce.

Change-Id: I6e9f451ece62e021ed06432d7135242eb9e03844
Signed-off-by: John Dennis <jdennis@redhat.com>