xrootd: Upgrade to xrootd4j 1.2.2

Fixes compatibility issues with xrootd plugins.

Target: trunk
Request: 2.7
Request: 2.6
Require-notes: yes
Require-book: no
Acked-by: Paul Millar <paul.millar@desy.de>
Patch: http://rb.dcache.org/r/6233

pom.xml

@@ -32,7 +32,7 @@
         <version.xerces>2.9.1</version.xerces>
         <version.jetty>8.1.13.v20130916</version.jetty>
         <version.wicket>6.9.1</version.wicket>
-        <version.xrootd4j>1.2.1</version.xrootd4j>
+        <version.xrootd4j>1.2.2</version.xrootd4j>
         <version.jglobus>2.0.6-rc4.d</version.jglobus>
         <version.openmq>4.5.2</version.openmq>