fix failing tests by addressing h2 reserved words

Author: jamesfredley

grails-datastore-gorm-hibernate5/src/test/groovy/grails/gorm/tests/events/UpdatePropertyInEventListenerSpec.groovy

@@ -69,6 +69,11 @@ class UpdatePropertyInEventListenerSpec extends Specification {
 class User {
     String username
     String password
+
+    static mapping = {
+        table '`user`'
+        password column: '`password`'
+    }
 }
 
 class PasswordEncodingListener extends AbstractPersistenceEventListener {

grails-datastore-gorm-hibernate5/src/test/groovy/grails/gorm/tests/validation/UniqueFalseConstraintSpec.groovy

@@ -37,4 +37,8 @@ class User {
     static constraints = {
         name unique: false
     }
+
+    static mapping = {
+        table '`user`'
+    }
 }