LP#1341013: Remove NameVirtualHost from eg.conf.in for Apache 2.4.

NameVirtualHost does nothing in Apache 2.4 and will be removed in
the next release.  We might as well get rid of it now and silence
a warning when starting Apache.

Signed-off-by: Jason Stephenson <jason@sigio.com>
Signed-off-by: Ben Shum <bshum@biblio.org>
LP#1341013: Load apache mod CGI

As of Apache 2.4, mod CGI needs to be enabled directly and is not built
with apache.  So let's add it to the Makefile for Ubuntu Trusty 14.04.

Also, add handling for disabling unwanted apache conf like serve-cgi-bin,
which can break offline cgi-bin script alias.

Signed-off-by: Ben Shum <bshum@biblio.org>
Signed-off-by: Jason Stephenson <jstephenson@mvlc.org>