Make ansible-playbook command configurable

The ansible-playbook command is currently hardcoded for the ansible and
ansible_local provisioners. This patch adds the config option
playbook_command to allow the user to change the command.

plugins/provisioners/ansible/config/base.rb

@@ -4,6 +4,7 @@ module VagrantPlugins
       class Base < Vagrant.plugin("2", :config)
 
         GALAXY_COMMAND_DEFAULT = "ansible-galaxy install --role-file=%{role_file} --roles-path=%{roles_path} --force".freeze
+        PLAYBOOK_COMMAND_DEFAULT = "ansible-playbook".freeze
 
         attr_accessor :extra_vars
         attr_accessor :galaxy_role_file
@@ -14,6 +15,7 @@ module VagrantPlugins
         attr_accessor :inventory_path
         attr_accessor :limit
         attr_accessor :playbook
+        attr_accessor :playbook_command
         attr_accessor :raw_arguments
         attr_accessor :skip_tags
         attr_accessor :start_at_task
@@ -33,6 +35,7 @@ module VagrantPlugins
           @inventory_path      = UNSET_VALUE
           @limit               = UNSET_VALUE
           @playbook            = UNSET_VALUE
+          @playbook_command    = UNSET_VALUE
           @raw_arguments       = UNSET_VALUE
           @skip_tags           = UNSET_VALUE
           @start_at_task       = UNSET_VALUE
@@ -53,6 +56,7 @@ module VagrantPlugins
           @inventory_path      = nil                      if @inventory_path      == UNSET_VALUE
           @limit               = nil                      if @limit               == UNSET_VALUE
           @playbook            = nil                      if @playbook            == UNSET_VALUE
+          @playbook_command    = PLAYBOOK_COMMAND_DEFAULT if @playbook_command    == UNSET_VALUE
           @raw_arguments       = nil                      if @raw_arguments       == UNSET_VALUE
           @skip_tags           = nil                      if @skip_tags           == UNSET_VALUE
           @start_at_task       = nil                      if @start_at_task       == UNSET_VALUE

plugins/provisioners/ansible/provisioner/base.rb

@@ -44,7 +44,7 @@ module VagrantPlugins
             end
           end
 
-          shell_command << "ansible-playbook"
+          shell_command << config.playbook_command
 
           shell_args = []
           @command_arguments.each do |arg|

plugins/provisioners/ansible/provisioner/host.rb

@@ -113,7 +113,7 @@ module VagrantPlugins
           prepare_environment_variables
 
           # Assemble the full ansible-playbook command
-          command = %w(ansible-playbook) << @command_arguments
+          command = [config.playbook_command] << @command_arguments
 
           # Add the raw arguments at the end, to give them the highest precedence
           command << config.raw_arguments if config.raw_arguments

test/unit/plugins/provisioners/ansible/config/guest_test.rb

@@ -27,6 +27,7 @@ describe VagrantPlugins::Ansible::Config::Guest do
                             inventory_path
                             limit
                             playbook
+                            playbook_command
                             provisioning_path
                             raw_arguments
                             skip_tags

test/unit/plugins/provisioners/ansible/config/host_test.rb

@@ -26,6 +26,7 @@ describe VagrantPlugins::Ansible::Config::Host, :skip_windows => true do
                             inventory_path
                             limit
                             playbook
+                            playbook_command
                             raw_arguments
                             raw_ssh_args
                             skip_tags