JSON Stream codec does not escape double quotes properly.

JSON Stream codec does not escape double quotes properly,
this is observable via Restconf:

1. Required is sal-test-model loaded in controller.

PUT http://localhost:8080/restconf/config/opendaylight-mdsal-list-test:top
Content-Type: application/xml

<top xmlns="urn:opendaylight:params:xml:ns:yang:controller:md:sal:test:list">
<top-level-list>
<name>bug-json</name>
<nested-list>
<name>0</name>
<type>"</type>
</nested-list>
</top-level-list>
</top>

GET http://localhost:8080/restconf/config/opendaylight-mdsal-list-test:top
Accept: application/json

Returns {{"top":{"top-level-list":[{"name":"bug-json","nested-list":[

]}]}}

Field type should read "\"".

Which is invalid JSON