Add support for passing ssh config file in via config

plugins/communicators/ssh/communicator.rb

@@ -376,7 +376,7 @@ module VagrantPlugins
         # Build the options we'll use to initiate the connection via Net::SSH
         common_connect_opts = {
           auth_methods:          auth_methods,
-          config:                false,
+          config:                ssh_info[:config],
           forward_agent:         ssh_info[:forward_agent],
           send_env:              ssh_info[:forward_env],
           keys_only:             ssh_info[:keys_only],

plugins/kernel_v2/config/ssh.rb

@@ -5,6 +5,7 @@ require_relative "ssh_connect"
 module VagrantPlugins
   module Kernel_V2
     class SSHConfig < SSHConnectConfig
+      attr_accessor :config
       attr_accessor :forward_agent
       attr_accessor :forward_x11
       attr_accessor :forward_env
@@ -22,6 +23,7 @@ module VagrantPlugins
       def initialize
         super
 
+        @config                  = UNSET_VALUE
         @forward_agent           = UNSET_VALUE
         @forward_x11             = UNSET_VALUE
         @forward_env             = UNSET_VALUE
@@ -46,6 +48,7 @@ module VagrantPlugins
       def finalize!
         super
 
+        @config = false if @config == UNSET_VALUE
         @forward_agent = false if @forward_agent == UNSET_VALUE
         @forward_x11   = false if @forward_x11 == UNSET_VALUE
         @forward_env   = false if @forward_env == UNSET_VALUE

test/unit/plugins/kernel_v2/config/ssh_test.rb

@@ -8,6 +8,8 @@ describe VagrantPlugins::Kernel_V2::SSHConfig do
   describe "#default" do
     it "defaults to vagrant username" do
       subject.finalize!
+      expect(subject.default.config).to eq(false)
+      expect(subject.default.port).to eq(22)
       expect(subject.default.username).to eq("vagrant")
     end
   end