Resource resolution should return a string

When being called by SDNC, expected response format is a String, not
a Json, then within SDNC we call jsonToTCtx by passing the String as
input.
When we receive the Json instead of a string, that function throw an 
exception because it expects a String.
Also, SDNC marshall directly within the SLI context the Json object,
but the path isn't the one being looked for.
Finally, resource resolution, by its definition, as per as its model,
should set the returned value as a string, not a json.

Change-Id: Iffae3128507069c2546e179c17e50fb16e43f310
Issue-ID: CCSDK-1606
Signed-off-by: Alexis de Talhouët <adetalhouet89@gmail.com>

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