MB-100: send correctly formed object literal json structs

I've found two places where {struct, ...} wasn't wrapped around
object literals.

Change-Id: I1a2101f23c46d8fe2e9a954c0f197137753cd12d
Reviewed-on: http://review.couchbase.org/28955
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Reviewed-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>