Address some compilation warnings

Author: lukebakken

deps/rabbitmq_cli/lib/rabbitmq/cli/ctl/commands/hash_password_command.ex

@@ -33,14 +33,14 @@ defmodule RabbitMQ.CLI.Ctl.Commands.HashPasswordCommand do
     {:bad_argument, "password cannot be an empty string"}
   end
 
-  def validate([arg], _options) do
+  def validate([_arg], _options) do
     :ok
   end
 
   use RabbitMQ.CLI.DefaultOutput
 
   def usage, do: "hash_password <cleartext_password>"
 
-  def banner([arg], %{node: node_name}),
+  def banner([arg], %{node: _node_name}),
     do: "Will hash password #{arg}"
 end

deps/rabbitmq_cli/lib/rabbitmq/cli/diagnostics/diagnostics_helpers.ex

@@ -25,7 +25,7 @@ defmodule RabbitMQ.CLI.Diagnostics.Helpers do
     check_port_connectivity(port, node_name, hostname, timeout)
   end
 
-  def check_port_connectivity(port, node_name, hostname_or_ip, timeout) do
+  def check_port_connectivity(port, _node_name, hostname_or_ip, timeout) do
     try do
       IO.puts("Will connect to #{hostname_or_ip}:#{port}")