[Travis] cleanup how fast cgi is setup

Tries to make the setup easier to read and closer to how travis
documents setting up apache + php + fastcgi.

Conflicts:
	bin/.travis/apache2/php5-fcgi
	doc/conf/httpd/apache2/vhost.fastcgi.dev.template
	doc/conf/httpd/apache2/vhost.fastcgi.prod.template
EZP-22568: Add Apache configuration & use for travis tests

Aims to add offical Apache configuration which is reused for testing
infrastructure as well, so avoiding duplicating vhost config across
online documentation and test infrastructure.