While neither the FreeBSD provisioner nor the SUSE provisioner support
installing Ansible using pip their ansible_install methods still get
called with that fourth argument. The result being these errors when
Vagrant tries to install Ansible.
/opt/vagrant/embedded/gems/gems/vagrant-1.9.5/plugins/provisioners/ansible/cap/guest/freebsd/ansible_install.rb:10:in `ansible_install': wrong number of arguments (4 for 3) (ArgumentError)
/opt/vagrant/embedded/gems/gems/vagrant-1.9.5/plugins/provisioners/ansible/cap/guest/suse/ansible_install.rb:9:in `ansible_install': wrong number of arguments (4 for 3) (ArgumentError)
The Arch provider, it too without pip support, already catches the
pip_args argument this way.
Vagrant Core Plugins
These are plugins that ship with Vagrant. Vagrant core uses its own plugin system to power a lot of the core pieces that ship with Vagrant. Each plugin will have its own README which explains its specific role.