Issue #814: Update Vagrantfile and docs for roles-in-VM.

Vagrantfile

@@ -122,7 +122,6 @@ Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
   if which('ansible-playbook')
     config.vm.provision 'ansible' do |ansible|
       ansible.playbook = "#{host_drupalvm_dir}/provisioning/playbook.yml"
-      ansible.galaxy_role_file = "#{host_drupalvm_dir}/provisioning/requirements.yml"
       ansible.extra_vars = {
         config_dir: host_config_dir
       }
@@ -137,7 +136,6 @@ Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
   # else
   #   config.vm.provision "ansible_local" do |ansible|
   #     ansible.playbook = "#{guest_drupalvm_dir}/provisioning/playbook.yml"
-  #     ansible.galaxy_role_file = "#{guest_drupalvm_dir}/provisioning/requirements.yml"
   #     ansible.extra_vars = {
   #       config_dir: guest_config_dir
   #     }

docs/other/overriding-configurations.md

@@ -45,9 +45,6 @@ config.vm.provider :virtualbox do |v|
   # Cap the host CPU execution at 50% usage.
   v.customize ["modifyvm", :id, "--cpuexecutioncap", "50"]
 end
-
-# Disable the galaxy role re-installation during provisions.
-config.vm.provisioners[0].config.galaxy_role_file = nil
 ```
 
 ### Example: Using the `vagrant-aws` provider

docs/other/php-56.md

@@ -1,7 +1,5 @@
 Drupal VM defaults to PHP 7, but you can install and use 5.6 if you need to maximize compatibility with older Drupal 6 and 7 sites.
 
-_Note: If you have Ansible installed on your host machine, make sure you're running the latest version of all Ansible role dependencies by running `ansible-galaxy install -r provisioning/requirements.yml --force` inside the root Drupal VM project folder._
-
 ## Ubuntu 16.04
 
 Ubuntu 16.04 Xenial defaults to PHP 7.0 in it's system packages. No older versions of PHP will be supported if using this base box.