MXS-1288: Deprecate reload config

The `reload config` command is now deprecated. The same functionality can
be found in the MaxScale REST API.

Documentation/Getting-Started/Configuration-Guide.md

@@ -1491,6 +1491,9 @@ can add a filter to a service and combine multiple filters in one service.
 
 ## Reloading Configuration
 
+**Note:** This functionality has been deprecated. Use the MaxScale REST API or the
+  MaxAdmin `alter` commands to change configuration values at runtime.
+
 The current MariaDB MaxScale configuration may be updated by editing the
 configuration file and then forcing MariaDB MaxScale to reread the configuration
 file. To force MariaDB MaxScale to reread the configuration file, send a SIGHUP

Documentation/Reference/MaxAdmin.md

@@ -1336,6 +1336,9 @@ of the values to 0, disables the throttling.
 
 ## Reloading The Configuration
 
+**Note:** This command has been deprecated. Use the MaxScale REST API or the
+  MaxAdmin `alter` commands to change configuration values at runtime.
+
 A command, _reload config_, is available that will cause MariaDB MaxScale to
 reload the maxscale.cnf configuration file. Note that not all configuration
 changes are taken into effect when the configuration is reloaded. Refer to

Documentation/Release-Notes/MaxScale-2.2.0-Release-Notes.md

@@ -104,11 +104,15 @@ The following commands have been deprecated:
 
 * `enable sessionlog-priority <session-id> [debug|info|notice|warning]`
 * `disable sessionlog-priority <session-id> [debug|info|notice|warning]`
+* `reload config`
 
-The commands can be issued, but have no effect.
+The `{ enable | disable } sessionlog-priority` commands can be issued, but they
+have no effect.
+
+#### Filenames as MaxAdmin Arguments
 
 MaxAdmin no longer attempts to interpret additional command line parameters as a
-file name to load commands from  (e.g. `maxadmin mycommands.txt`). The shell
+file name to load commands from (e.g. `maxadmin mycommands.txt`). The shell
 indirection operator `<` should be used to achieve the same effect (`maxadmin <
 mycommands.txt`).
 

server/modules/routing/debugcli/debugcmd.c

@@ -672,7 +672,7 @@ struct subcommand reloadoptions[] =
 {
     {
         "config", 0, 0, reload_config,
-        "Reload the configuration",
+        "[Deprecated] Reload the configuration",
         "Usage: reload config",
         {0}
     },
@@ -2281,7 +2281,10 @@ reload_dbusers(DCB *dcb, SERVICE *service)
 static void
 reload_config(DCB *dcb)
 {
-    dcb_printf(dcb, "Reloading configuration from file.\n");
+    dcb_printf(dcb, "Reloading configuration from file.\n\n"
+               "Warning! This command has been deprecated, please use the `alter`\n"
+               "commands or use the MaxScale REST API to change the configuration\n"
+               "at runtime.\n");
     config_reload();
 }