Top comment for getNodeByQuery() improved.
Remove wrong decrRefCount() from getNodeByQuery().

This fixes issue #607.
Cluster: make valgrind happy initializing all the bytes of the node IP.
Removed useless newlines from hashTypeCurrentObject().
Cluster: sanity checks on the cluster bus message length.
Merge branch 'unstable' of github.com:antirez/redis into unstable
Cluster: specific error code for cluster down condition.
redis-trib: make a few comments 80-cols friendly.