nhibernateGH-3530: Rearrange mappings to and remove the schema-action attributes.

The SchemaExporter only creates the schema for a table based on the mapping
for the first class it is provided. Subsequent mappings will not affect the
schema generated.

Author: David Ellingsworth

src/NHibernate.Test/NHSpecificTest/GH3530/Mappings.hbm.xml

@@ -1,16 +1,16 @@
 <?xml version="1.0" encoding="utf-8" ?>
 <hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="NHibernate.Test"
                    namespace="NHibernate.Test.NHSpecificTest.GH3530">
-  <!-- The schema exporter should ignore this version but we should be able to map it to the version created below. -->
-  <class name="LocaleEntity" schema-action="validate" table="LocaleEntity">
+  <!-- The schema exporter only exports the schema of the first class for a table. -->
+  <class name="SchemaLocaleEntity" table="LocaleEntity">
     <id name="Id" generator="guid.comb" />
     <property name="IntegerValue" column="IntegerValue"/>
     <property name="DateTimeValue" column="DateTimeValue"/>
     <property name="DoubleValue" column="DoubleValue"/>
     <property name="DecimalValue" column="DecimalValue"/>
   </class>
-  <!-- The schema exporter should export this version of the entity and generate text columns for all types. -->
-  <class name="SchemaLocaleEntity" table="LocaleEntity" schema-action="export">
+  <!-- The schema exporter will ignore this because the above class already creates the table. -->
+  <class name="LocaleEntity" table="LocaleEntity">
     <id name="Id" generator="guid.comb" />
     <property name="IntegerValue" column="IntegerValue"/>
     <property name="DateTimeValue" column="DateTimeValue"/>