Better error when docker can't open mongodb
Better error when docker can't open mongodb

Two changes:

1. Fix spelling of "connect". It had an extra "n" before.
2. Add info about mongo-url and mongo-database.

Before:

    [marca@marca-mac2 tsuru]$ ~/go/bin/tsr api
    Using the database "tsurudb" from the server "127.0.0.1:27017".
    Using "docker" provisioner.
    Cluster Storage: Unable to connnect to mongodb: no reachable servers

After:

    [marca@marca-mac2 tsuru]$ ~/go/bin/tsr api
    Using the database "tsurudb" from the server "127.0.0.1:27017".
    Using "docker" provisioner.
    Cluster Storage: Unable to connect to mongodb: no reachable servers (docker:cluster:mongo-url = "127.0.0.1:27017"; docker:cluster:mongo-database = "cluster")

hcxiong/tsuru,cgvarela/tsuru,hcxiong/tsuru,Endika/tsuru,hugoantunes/tsuru,guilhermebr/tsuru,4eek/tsuru,Endika/tsuru,Endika/tsuru,gciotta/tsuru,tuxmonteiro/tsuru,guilhermebr/tsuru,ggarnier/tsuru,hcxiong/tsuru,4eek/tsuru,ArxdSilva/tsuru,firebitsbr/tsuru,ggarnier/tsuru,hugoantunes/tsuru,kgrvamsi/tsuru,RichardKnop/tsuru,firebitsbr/tsuru,gciotta/tsuru,ArxdSilva/tsuru,ArxdSilva/tsuru,firebitsbr/tsuru,mderaldo/tsuru,jblancett/tsuru,tuxmonteiro/tsuru,RichardKnop/tsuru,cezarsa/tsuru,cgvarela/tsuru,jblancett/tsuru,gwmoura/tsuru,ggarnier/tsuru,cezarsa/tsuru,mderaldo/tsuru,tsuru/tsuru,tsuru/tsuru,ggarnier/tsuru,ArxdSilva/tsuru,4eek/tsuru,jblancett/tsuru,gwmoura/tsuru,tuxmonteiro/tsuru,kgrvamsi/tsuru,mderaldo/tsuru,cgvarela/tsuru,guilhermebr/tsuru,cezarsa/tsuru,gciotta/tsuru,guilhermebr/tsuru,tsuru/tsuru,cezarsa/tsuru,kgrvamsi/tsuru,RichardKnop/tsuru,tsuru/tsuru,gwmoura/tsuru