tests: Break out duplicate schema verification functionality.

All schema tests have identical functionality, so avoid the duplication.

tests/storagevolschematest

@@ -1,33 +1,9 @@
 #!/bin/sh
 
-test -z "$srcdir" && srcdir=`pwd`
-test -z "$abs_srcdir" && abs_srcdir=`pwd`
+source ./schematestutils.sh
 
 DIRS="storagevolschemadata"
+SCHEMA="storagevol.rng"
 
-n=0
-f=0
-for dir in $DIRS
-do
-  XML=`find $abs_srcdir/$dir -name '*.xml'` || exit 1
+check_schema "$DIRS" "$SCHEMA"
 
-  for xml in $XML
-  do
-    n=`expr $n + 1`
-    printf "%4d) %.60s  " $n $(basename $(dirname $xml))"/"$(basename $xml)
-    result=`xmllint --relaxng $srcdir/../docs/schemas/storagevol.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