Add serialization/deserialization for tosca policy

Includes:
a) Added serialization/deserialization for tosca policy
b) Added serialization/deserialization for tosca topology template
c) Added serialization/deserialization for tosca service template

More junit tests for serialization/deserialization are being added,
using the example input/output.

Issue-ID: POLICY-1441
Change-Id: I5ef6b5ede35cfb1e88619e92535393cf8056987b
Signed-off-by: Chenfei Gao <cgao@research.att.com>
diff --git a/models-dao/src/test/resources/META-INF/persistence.xml b/models-dao/src/test/resources/META-INF/persistence.xml
index 1f430bc..5779deb 100644
--- a/models-dao/src/test/resources/META-INF/persistence.xml
+++ b/models-dao/src/test/resources/META-INF/persistence.xml
@@ -25,7 +25,7 @@
 
         <class>org.onap.policy.models.dao.converters.CDataConditioner</class>
         <class>org.onap.policy.models.dao.converters.Uuid2String</class>
-        <class>org.onap.policy.models.base.concepts.PfConcepttKey</class>
+        <class>org.onap.policy.models.base.PfConceptKey</class>
         <class>org.onap.policy.models.dao.DummyConceptEntity</class>
         <class>org.onap.policy.models.dao.DummyReferenceEntity</class>