Added test to validate all domain XML files against schema

tests/domainschematest

@@ -0,0 +1,32 @@
+#!/bin/sh
+
+test -z "$srcdir" && srcdir=`pwd`
+
+DOMAINDIRS="qemuxml2argvdata sexpr2xmldata xmconfigdata xml2sexprdata"
+
+n=0
+f=0
+for dir in $DOMAINDIRS
+do
+  XML=`find $dir -name '*.xml'`
+
+  for xml in $XML
+  do
+    n=`expr $n + 1`
+    printf "%4d) %-60s  " $n $xml
+    result=`xmllint --relaxng $srcdir/../docs/libvirt.rng --noout $xml 2>&1`
+    ret=$?
+    if test $ret = 0; then
+        echo "OK"
+    else
+        echo "FAILED"
+        echo $result
+        f=`expr $f + 1`
+    fi
+  done
+done
+echo "Validated $n files, $f failed"
+
+ret=0
+test $f != 0 && ret=255
+exit $ret