Add ssh verbose mode for Vagrant

gistfile1.diff

diff --git a/config/default.rb b/config/default.rb
index 8a50b7e..2dfb27a 100644
--- a/config/default.rb
+++ b/config/default.rb
@@ -11,6 +11,7 @@ Vagrant.configure("1") do |config|
   config.ssh.forward_agent = false
   config.ssh.forward_x11 = false
   config.ssh.shell = "bash -l"
+  config.ssh.verbose = false
 
   config.vm.auto_port_range = (2200..2250)
   config.vm.box_url = nil
diff --git a/plugins/communicators/ssh/communicator.rb b/plugins/communicators/ssh/communicator.rb
index 5551375..62a18c6 100644
--- a/plugins/communicators/ssh/communicator.rb
+++ b/plugins/communicators/ssh/communicator.rb
@@ -144,6 +144,9 @@ module VagrantPlugins
           :config                => false,
           :forward_agent         => ssh_info[:forward_agent]
         }
+        if @machine.config.ssh.verbose
+          opts[:verbose] = 0
+        end
 
         # Check that the private key permissions are valid
         Vagrant::Util::SSH.check_key_permissions(ssh_info[:private_key_path])
diff --git a/plugins/kernel_v1/config/ssh.rb b/plugins/kernel_v1/config/ssh.rb
index d6719a1..b5d0eca 100644
--- a/plugins/kernel_v1/config/ssh.rb
+++ b/plugins/kernel_v1/config/ssh.rb
@@ -14,6 +14,7 @@ module VagrantPlugins
       attr_accessor :forward_agent
       attr_accessor :forward_x11
       attr_accessor :shell
+      attr_accessor :verbose
 
       def validate(env, errors)
         [:username, :host, :max_tries, :timeout].each do |field|