tests: add xlconfigdata to domainschematests

Include the XML files under tests/xlconfigdata in the domain
schema tests

tests/domainschematest

@@ -9,6 +9,7 @@ DIRS="$DIRS domainschemadata qemuargv2xmldata qemuxml2argvdata sexpr2xmldata"
 DIRS="$DIRS xmconfigdata xml2sexprdata qemuxml2xmloutdata"
 DIRS="$DIRS lxcxml2xmldata lxcxml2xmloutdata"
 DIRS="$DIRS bhyvexml2argvdata genericxml2xmlindata genericxml2xmloutdata"
+DIRS="$DIRS xlconfigdata"
 SCHEMA="domain.rng"
 
 check_schema "$DIRS" "$SCHEMA"