Adds `BIN_PATH` to create-cluster
Adds `BIN_PATH` to create-cluster

Allows for setting the binaries path if used outside the upstream repo.

Also documents `call` in usage clause (TODO: port to
`redis-cli --cluster call` or just deprecate it).

JackieXie168/redis,JackieXie168/redis,JackieXie168/redis,JackieXie168/redis