Document SSH commands gerrit plugin {ls|install|remove|reload}

Change-Id: If6a45760cbc4ebdfb6cfeea4b39034cae1415b82
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>

Documentation/cmd-plugin-reload.txt

@@ -0,0 +1,43 @@
+plugin reload
+=============
+
+NAME
+----
+plugin reload - Reload/Restart plugins.
+
+SYNOPSIS
+--------
+[verse]
+'ssh' -p <port> <host> 'gerrit plugin reload'
+  <NAME> ...
+
+DESCRIPTION
+-----------
+Reload/Restart plugins. Whether a plugin is reloaded or restarted
+is defined by the plugin's link:dev-plugins.html#reload_method[reload method].
+
+ACCESS
+------
+Caller must be a member of the privileged 'Administrators' group.
+
+SCRIPTING
+---------
+This command is intended to be used in scripts.
+
+OPTIONS
+-------
+<NAME>::
+	Name of the plugin that should be reloaded.  Multiple names of
+	plugins that should be reloaded may be specified.
+
+EXAMPLES
+--------
+Reload a plugin:
+
+====
+	ssh -p 29418 localhost gerrit plugin reload my-plugin
+====
+
+GERRIT
+------
+Part of link:index.html[Gerrit Code Review]