Refactor: migrate testapp to nlohmann::json [8/n]
Refactor: migrate testapp to nlohmann::json [8/n]

Move testapp_rbac to nlohmann::json

Change-Id: I05be154626d64124bebeda5c16e6c4675bc012d9
Reviewed-on: http://review.couchbase.org/101021
Tested-by: Build Bot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Dave Rigby <a09264da4832c7ff1d3bf1608a19f4b870f93750@couchbase.com>

daverigby/kv_engine,daverigby/kv_engine,daverigby/kv_engine,daverigby/kv_engine