frontend: fix handling of SRR requests over IPv6

use appropriate InetAddresses#forUriString when processing URL.

Ticket: #10243, #10225
Acked-by: Lea Morschel
Target: master, 7.2, 7.1, 7.0, 6.2
Require-book: no
Require-notes: yes
(cherry picked from commit cbb2c8e)
Signed-off-by: Tigran Mkrtchyan <tigran.mkrtchyan@desy.de>

modules/dcache-frontend/src/main/java/org/dcache/restful/resources/srr/SrrResource.java

@@ -115,7 +115,7 @@ public void setGroupMapping(String mapping) {
     @Path("/")
     public Response getSrr() throws InterruptedException, CacheException, NoRouteToCellException {
 
-        InetAddress remoteAddress = InetAddresses.forString(request.getRemoteAddr());
+        InetAddress remoteAddress = InetAddresses.forUriString(request.getRemoteAddr());
         if (!remoteAddress.isLoopbackAddress()) {
             throw new ForbiddenException();
         }