Add salt-masterless provisioner doc

website/docs/provisioners/salt-masterless.html.md

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+---
+layout: "docs"
+page_title: "Provisioner: salt-masterless"
+sidebar_current: "docs-provisioners-salt-masterless"
+description: |-
+  The salt-masterless Terraform provisioner provisions machines built by Terraform
+---
+
+# Salt Masterless Provisioner
+
+Type: `salt-masterless`
+
+The `salt-masterless` Terraform provisioner provisions machines built by Terraform
+using [Salt](http://saltstack.com/) states, without connecting to a Salt master. The `salt-masterless` provisioner supports `ssh` [connections](/docs/provisioners/connection.html).
+
+## Requirements
+
+The `salt-masterless` provisioner has some prerequisites. `cURL` must be available on the remote host.
+
+## Example usage
+
+The example below is fully functional.
+
+```hcl
+
+provisioner "salt-masterless" {
+    "local_state_tree" = "/srv/salt"
+}
+```
+
+## Argument Reference
+
+The reference of available configuration options is listed below. The only
+required argument is the path to your local salt state tree.
+
+Optional:
+
+-   `bootstrap_args` (string) - Arguments to send to the bootstrap script. Usage
+    is somewhat documented on
+    [github](https://github.com/saltstack/salt-bootstrap), but the [script
+    itself](https://github.com/saltstack/salt-bootstrap/blob/develop/bootstrap-salt.sh)
+    has more detailed usage instructions. By default, no arguments are sent to
+    the script.
+
+-   `disable_sudo` (boolean) - By default, the bootstrap install command is prefixed with `sudo`. When using a
+    Docker builder, you will likely want to pass `true` since `sudo` is often not pre-installed.
+
+-   `remote_pillar_roots` (string) - The path to your remote [pillar
+    roots](http://docs.saltstack.com/ref/configuration/master.html#pillar-configuration).
+    default: `/srv/pillar`. This option cannot be used with `minion_config`.
+
+-   `remote_state_tree` (string) - The path to your remote [state
+    tree](http://docs.saltstack.com/ref/states/highstate.html#the-salt-state-tree).
+    default: `/srv/salt`. This option cannot be used with `minion_config`.
+
+-   `local_pillar_roots` (string) - The path to your local [pillar
+    roots](http://docs.saltstack.com/ref/configuration/master.html#pillar-configuration).
+    This will be uploaded to the `remote_pillar_roots` on the remote.
+
+-   `local_state_tree` (string) - The path to your local [state
+    tree](http://docs.saltstack.com/ref/states/highstate.html#the-salt-state-tree).
+    This will be uploaded to the `remote_state_tree` on the remote.
+
+-   `custom_state` (string) - A state to be run instead of `state.highstate`.
+    Defaults to `state.highstate` if unspecified.
+
+-   `minion_config` (string) - The path to your local [minion config
+    file](http://docs.saltstack.com/ref/configuration/minion.html). This will be
+    uploaded to the `/etc/salt` on the remote. This option overrides the
+    `remote_state_tree` or `remote_pillar_roots` options.
+
+-   `grains_file` (string) - The path to your local [grains file](https://docs.saltstack.com/en/latest/topics/grains). This will be
+    uploaded to `/etc/salt/grains` on the remote.
+
+-   `skip_bootstrap` (boolean) - By default the salt provisioner runs [salt
+    bootstrap](https://github.com/saltstack/salt-bootstrap) to install salt. Set
+    this to true to skip this step.
+
+-   `temp_config_dir` (string) - Where your local state tree will be copied
+    before moving to the `/srv/salt` directory. Default is `/tmp/salt`.
+
+-   `no_exit_on_failure` (boolean) - Terraform will exit if the `salt-call` command
+    fails. Set this option to true to ignore Salt failures.
+
+-   `log_level` (string) - Set the logging level for the `salt-call` run.
+
+-   `salt_call_args` (string) - Additional arguments to pass directly to `salt-call`. See
+    [salt-call](https://docs.saltstack.com/ref/cli/salt-call.html) documentation for more
+    information. By default no additional arguments (besides the ones Terraform generates)
+    are passed to `salt-call`.
+
+-   `salt_bin_dir` (string) - Path to the `salt-call` executable. Useful if it is not
+    on the PATH.