Welcome page gives 404 if JBOSS_HOME contains lower case drive letter (Windows)

Description of problem:
EAP server welcome page (aka http://localhost:8080/ ) returns "404 - Not Found" once the JBOSS_HOME contains lower case drive letter on Windows.

This is regression against 6.4.0, 7.0.0, 7.1.0.DR15, so priority of this jira is blocker

Similar jira from 7.0: JBEAP-2054

Steps to Reproduce:

1. start the EAP using absolute path with lower case drive letter: C:\Users\Administrator>c:\Users\Administrator\playground\7.1.0.DR16\jboss-eap-7.1\bin\standalone.bat
2. get the response from welcome page

   C:\Users\Administrator>wget64.exe --server-response --spider http://localhost:8080
   Spider mode enabled. Check if remote file exists.
   --2017-04-10 10:34:21--  http://localhost:8080/
   Resolving localhost (localhost)... ::1, 127.0.0.1
   Connecting to localhost (localhost)|::1|:8080... failed: Bad file descriptor.
   Connecting to localhost (localhost)|127.0.0.1|:8080... connected.
   HTTP request sent, awaiting response...
     HTTP/1.1 404 Not Found
     Connection: keep-alive
     X-Powered-By: Undertow/1
     Server: JBoss-EAP/7
     Content-Length: 74
     Content-Type: text/html
     Date: Mon, 10 Apr 2017 08:34:22 GMT
   Remote file does not exist -- broken link!!!