Fix Errors in "reference21_30" Tests

Regression introduced by fixes for EJBTHREE-1222; interfaces for business stubs no longer implement EJBObject/EJBLocalObject. These must be obtained via Home.create<METHOD>(). Ensure all Local/Remote views have defined home, and remote/local views are obtained properly.

Example Stacktrace:

java.lang.ClassCastException: $Proxy6
at org.jboss.ejb3.test.reference21_30.unit.ReferenceTestCase.testStatefulSessionHome30(ReferenceTestCase.java:144)
at junit.extensions.TestDecorator.basicRun(TestDecorator.java:24)
at junit.extensions.TestSetup$1.protect(TestSetup.java:23)
at junit.extensions.TestSetup.run(TestSetup.java:27)