Do not put JsonValue inside JSON schemas

With COMMONS-133, OpenDJ is not able to start itself.

Running OpenDJ with the current PR applied results in the following exception:
```
(org.forgerock.opendj.rest2ldap.Rest2LdapJsonConfiguratorTest)  Time elapsed: 0.085 sec  <<< FAILURE!
java.lang.IllegalStateException: The given Schema name 'frapi:opendj:rest2ldap:object:1.0' already exists but the Schema objects are not equal
	at org.forgerock.api.CrestApiProducer.merge(CrestApiProducer.java:129)
	at org.forgerock.api.CrestApiProducer.merge(CrestApiProducer.java:45)
	at org.forgerock.services.routing.AbstractRouter.buildApi(AbstractRouter.java:369)
	at org.forgerock.services.routing.AbstractRouter.notifyDescriptorChange(AbstractRouter.java:342)
	at org.forgerock.services.routing.AbstractRouter.api(AbstractRouter.java:290)
	at org.forgerock.opendj.rest2ldap.Resource.subResourcesApi(Resource.java:652)
	at org.forgerock.opendj.rest2ldap.SubResource$SubResourceHandler.api(SubResource.java:221)
	at org.forgerock.opendj.rest2ldap.SubResource$SubResourceHandler.api(SubResource.java:141)
	at org.forgerock.services.routing.AbstractRouter.buildApi(AbstractRouter.java:361)
	at org.forgerock.services.routing.AbstractRouter.notifyDescriptorChange(AbstractRouter.java:342)
	at org.forgerock.services.routing.AbstractRouter.api(AbstractRouter.java:290)
	at org.forgerock.opendj.rest2ldap.DescribableRequestHandler.api(DescribableRequestHandler.java:109)
	at org.forgerock.opendj.rest2ldap.DescribableRequestHandler.api(DescribableRequestHandler.java:40)
	at org.forgerock.services.routing.AbstractRouter.buildApi(AbstractRouter.java:361)
	at org.forgerock.services.routing.AbstractRouter.notifyDescriptorChange(AbstractRouter.java:342)
	at org.forgerock.services.routing.AbstractRouter.api(AbstractRouter.java:290)
	at org.forgerock.json.resource.FilterChain.api(FilterChain.java:272)
	at org.forgerock.json.resource.FilterChain.api(FilterChain.java:38)
	at org.forgerock.services.routing.AbstractRouter.buildApi(AbstractRouter.java:361)
	at org.forgerock.services.routing.AbstractRouter.notifyDescriptorChange(AbstractRouter.java:342)
	at org.forgerock.services.routing.AbstractRouter.api(AbstractRouter.java:290)
	at org.forgerock.opendj.rest2ldap.DescribableRequestHandler.api(DescribableRequestHandler.java:109)
	at org.forgerock.opendj.rest2ldap.Rest2LdapJsonConfiguratorTest.configureEndpoints(Rest2LdapJsonConfiguratorTest.java:81)
	at org.forgerock.opendj.rest2ldap.Rest2LdapJsonConfiguratorTest.testConfigureEndpointsWithApiDescription(Rest2LdapJsonConfiguratorTest.java:61)
```

The problem arises in `CrestApiProducer.merge(List<ApiDescription> descriptions)` when it calls `Definitions.put(String, Schema)`.
Here are the lines throwing the exception:
```java
            if (definitions.containsKey(name) && !definitions.get(name).equals(schema)) {
                throw new IllegalStateException("The given Schema name"
                        + " '" + name + "' already exists but the Schema objects are not equal");
            }
```
In our case, we are generating the whole type hierarchy for the definition in use for each ApiDescription.
We do that because we cannot possibly know if a type has already been seen before or not.

In this case, this happens when trying to merge definitions for `frapi:opendj:rest2ldap:object:1.0`
which is our base type (think about `java.lang.Object`). They have the same textual json schema.

This happens because `JsonValue.equals(JsonValue)` is never equal.
This is caused by a lack of unwrapping in `JsonValue.put(String, Object)` and other such methods.
It may be fixed by COMMONS-135.

The fix in OpenDJ is to always unwrap the JsonValue before calling `JsonValue.put(String, Object)`.