[HttpClient][PATCH] Take 2 with Host request-header

[Ryan Lubke <Ry...@Sun.COM>]

Ok,

Based on advise regarding the previous patch, I've attached a new patch
for HttpMethodBase as well as TestWebappHeaders.  

I thought TestWebappHeaders was the most appropriate location for this
test.  If there is a better place, let me know.

Lastly, there is still the outstanding issue of configuration for 
strict compliance in both HTTP/1.0 and HTTP/1.1.  This patch
makes note that this still needs to be addressed.


Changes HttpMethodBase
-------------------------

 - Added isIpAddress(String) - determines if provided value is an
   IP address or not (performs validation that the parsed values
   are in the required range, etc).

 - addHostRequestHeader - If the value provided for the target host
   is an IP address, the Host header will be sent, but without a 
   value.

   If the value provided is a hostname, and the port is 80,
   then only the value will be present in the Host request-header.
   Any port other than 80 will be present in the Host request-header
   in the form of <hostname>:<port>.

Changes to TestWebappHeaders
------------------------------------
 - Added test to validate the behavior of addHostRequestHeader in the
   case of an IP address and hostname.