Document missing configuraiton variables & sort

as recommended by best practices:

> Every argument accepted from outside of the role should be given
> a default value in defaults/main.yml.

https://github.com/oasis-roles/meta_standards#vars-vs-defaults

defaults/main.yml

@@ -10,6 +10,9 @@ sshd_skip_defaults: false
 # daemon at all
 sshd_manage_service: true
 
+# If the below is false, don't reload the ssh daemon on change
+sshd_allow_reload: true
+
 # If the below is true, also install service files from the templates pointed
 # to by the `sshd_service_template_*` variables
 sshd_install_service: false
@@ -17,9 +20,6 @@ sshd_service_template_service: sshd.service.j2
 sshd_service_template_at_service: sshd@.service.j2
 sshd_service_template_socket: sshd.socket.j2
 
-# If the below is false, don't reload the ssh daemon on change
-sshd_allow_reload: true
-
 # If the below is true, create a backup of the config file when the template is copied
 sshd_backup: true
 
@@ -39,6 +39,10 @@ sshd_sysconfig_use_strong_rng: 0
 # Empty dicts to avoid errors
 sshd: {}
 
+# The path to sshd_config file. This is useful when creating an included
+# configuration file snippet or configuring second sshd service
+sshd_config_file: /etc/ssh/sshd_config
+
 ### VARS DEFAULTS
 ### The following are defaults for OS specific configuration in var files in
 ### this role. They should not be set directly by role users.