MB-32514: Migrate getConnectionId to nlohmann::json
MB-32514: Migrate getConnectionId to nlohmann::json

Migrate the getConnectionId function in testapp_bucket to
nlohmann::json

Change-Id: Ie2d34af97bf3676bd41b33f7b2376ee90d8baa38
Reviewed-on: http://review.couchbase.org/104125
Reviewed-by: Trond Norbye <60edd2ef23891a753f231b0c6f161dc634079a93@couchbase.com>
Tested-by: Build Bot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>

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