jetty:run was not working when mvn invoked with -f from another cwd; this seems to fix it.

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@5056 71c3de6d-444a-0410-be80-ed276b4c234a

war/pom.xml

@@ -173,7 +173,7 @@
           <userRealms>
             <userRealm implementation="org.mortbay.jetty.security.HashUserRealm">
               <name>default</name>
-              <config>src/realm.properties</config>
+              <config>${basedir}/src/realm.properties</config>
             </userRealm>
           </userRealms>
           <systemProperties>