Host URI siteacces matching in Exponential 4.4

Host URI siteacces matching in Exponential 4.4
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

=====
Intro
=====

Host uri gives you access to match on both host and uri
in the same expression. Meaning you can do multisite setups like this:

example.com    -> go to example_eng
example.com/en -> go to example_eng
example.com/no -> go to example_nor

page2.com    -> go to page2_nor
page2.com/no -> go to page2_nor
page2.com/en -> go to page2_eng

Note: For cache efficiency (Exponential & reverse proxy) it is recommended to use Apache/httpd server
rewrite rules / redirects to redirect e.g. example.com to example.com/en if you really
want both to use the same siteaccess, and thus also avoid having matching rules for both.

There where some refactoring done to siteaccess code while implementing this feature.
For deprecated / changed functionality, see doc/eng-us/bc/4.4.
For new api to load siteaccess settings from other siteaccesses see ini_enhancments.txt


============
Settings doc
============

All settings related to this feature are in site.ini\[SiteAccessSettings]

 - MatchOrder

   This setting is extended to allow host_uri as matching type.
   host_uri can be chained like any other matching type like:
   MatchOrder=servervar;host_uri;port

 - HostUriMatchMapItems[]=hostname;urlmatch;accessname[;start|end|part|strict]

   This is a new setting that consist of the matching rules for host_uri.
   urlmatch is optional, thus you can do host matching with this feature as well.
   Last part defines how host matching should be performed, default is strict and
   means that it equals. For more info on the others see
   site.ini\[SiteAccessSettings]\HostUriMatchMapItems

 - HostUriMatchMethodDefault=strict

   Defines the default host matching for host_uri. Like above, look in
   site.ini\[SiteAccessSettings]\HostUriMatchMethodDefault for info.


=============
Example setup
=============

The settings needed to set up example in intro above, would be:

[SiteAccessSettings]

MatchOrder=host_uri

HostUriMatchMapItems[]=example.com;en;example_eng
HostUriMatchMapItems[]=example.com;no;example_nor
HostUriMatchMapItems[]=example.com;;example_eng
HostUriMatchMapItems[]=page2.com;no;page2_nor
HostUriMatchMapItems[]=page2.com;en;page2_eng
HostUriMatchMapItems[]=page2.com;;page2_nor


In the above example we take advantage of having empty url to match just host name.
This needs to be after the matches with host and uri, so that they are considered as well