ENG-7190: return Host header which has our external ip listed as opposed...

... to what you typed in browser to identify current server in VMC.
I can't use ReverseDNS as I want this value to be exactly same as IPADDRESS returned in SystemInformation overview. DNS on server does not mean externally accessible. If I have to use this SystemInformation would need change also. Remember this addition of "Host" header is to make sure VMC can corelate what the current server is from the servers returned by SystemInformation OVERVIEW