Replace GsonProvider to JacksonJaxbJsonProvider
Problem: GsonProvider uses com.google.gson.Gson to convert a javabean to a json string
and is not compatitble with ApiDelaration which has a defined field:
com.fasterxml.jackson.databind.node.ObjectNode models for the swagger model object.
So it should use ObjectMapper to convert swagger api object instead of google Gson.
Obviously, com.fasterxml.jackson.jaxrs.json.JacksonJaxbJsonProvider can achieve this conversion
by using the org.opendaylight.netconf.sal.rest.doc.jaxrs.JaxbContextResolver.
JIRA: NETCONF-588
Change-Id: Iee8a0528a29601a8737ed0247f183fddc9c5ebe5
Signed-off-by: wsd <wusandi@163.com>