(MAINT) Make Port Check Configurable

This change makes the port and port timeout configurable via the YAML
config file. Before these were hard coded to 22 and 5, respectively.

Tests have been added to verify the default is chosen when not
configured and the configuration is picked up when supplied.

lib/vmpooler/pool_manager.rb

@@ -1,5 +1,12 @@
 module Vmpooler
   class PoolManager
+
+    # Defaults
+    # port number to verify pending VM is ready
+    DEFAULT_PORT_NO      = 22
+    # timeout, in seconds, when connecting to DEFAULT_PORT_NO
+    DEFAULT_PORT_TIMEOUT = 5
+
     def initialize(config, logger, redis, graphite=nil)
       $config = config
 
@@ -32,8 +39,8 @@ module Vmpooler
 
       if host
         begin
-          Timeout.timeout(5) do
-            TCPSocket.new vm, 22
+          Timeout.timeout($config[:config]['port_timeout'] || DEFAULT_PORT_TIMEOUT) do
+            TCPSocket.new vm, ($config[:config]['port'] || DEFAULT_PORT_NO)
           end
           move_pending_vm_to_ready(vm, pool, host)
         rescue