-bucket param doesn't work in conjunction with config file where bucket not specified

[andreibaranouski]

config file doesn't have bucket but I try to set it as param

cat gateway_config_template_nobucket.json 
{
     "adminInterface": ":4985",
   "databases": {
         "db": {
           "server": "http://127.0.0.1:8091/",
          "users": {
            "GUEST": {"disabled": false, "admin_channels": ["*"] }
             }
        }
    }
 }

Andreis-MacBook-Pro:sync_gateway andrei$ ./bin/sync_gateway -bucket default gateway_config_template_nobucket.json
2015-05-25T23:48:38.840+03:00 ==== Couchbase Sync Gateway/master(8546803+CHANGES) ====
2015-05-25T23:48:38.840+03:00 Configured Go to use all 8 CPUs; setenv GOMAXPROCS to override this
2015-05-25T23:48:38.840+03:00 Opening db /db as bucket "db", pool "default", server <http://127.0.0.1:8091/>
2015-05-25T23:48:38.841+03:00 Opening Couchbase database db on <http://127.0.0.1:8091/>
2015-05-25T23:48:38.850+03:00 FATAL: Error opening database: 502 Unable to connect to server: No bucket named db -- rest.RunServer() at config.go:479

[zgramana]

Need to consider this part of the config validation work.

[andreibaranouski]

I close this bug since scenario is not entirely valid. because when we point bucket in parameters it does not have to override the bucket name in the config file. I fixed the test created by Li. more detailed inspection of all behaviors for config files will be made according to #826