FIX: improved support for @DbForeignKey(noConstraint = true) (#1527)

* FIX: improved support for DbForeignKey(noConstraint = true)

* FIX: Tests for mariadb and sqlserver

* FIX: SqlServer was still incorrect

* FIX: not ommit property for formula

* Update BeanDescriptor.java (typo fix)

fix typo column (no code change!)

src/main/java/io/ebeaninternal/server/query/STreePropertyAssocOne.java

@@ -1,5 +1,6 @@
 package io.ebeaninternal.server.query;
 
+import io.ebean.bean.EntityBean;
 import io.ebeaninternal.server.type.ScalarType;
 
 public interface STreePropertyAssocOne extends STreePropertyAssoc {
@@ -13,4 +14,14 @@ public interface STreePropertyAssocOne extends STreePropertyAssoc {
    * Return the scalar type of the associated id property.
    */
   ScalarType<?> getIdScalarType();
+
+  /**
+   * Returns true, if this relation has a foreign key.
+   */
+  boolean hasForeignKey();
+
+  /**
+   * Return the property value as an entity bean from the parent.
+   */
+  public EntityBean getValueAsEntityBean(EntityBean parentBean);
 }