cli: minor improvements in commands' help messages

* --token ask in "slapos configure client" is not supported ("ask" is interpreted
     as the argument value, iow the token)
   * node_name : a node name is an unknown concept. On slapos.vifib.com interface, the
     nodes have titles and references

/reviewed-on !158

slapos/cli/configure_client.py

@@ -59,7 +59,7 @@ class ConfigureClientCommand(ClientConfigCommand):
 
         ap.add_argument('--token',
                         help="SlapOS 'credential security' authentication token "
-                             "(use '--token ask' for interactive prompt)")
+                             "(if this parameter is omitted, the token will be prompted during configuration)")
 
         return ap
 

slapos/cli/register.py

@@ -59,7 +59,7 @@ class RegisterCommand(Command):
         ap = super(RegisterCommand, self).get_parser(prog_name)
 
         ap.add_argument('node_name',
-                        help='Name of the node')
+                        help='Chosen title for the node')
 
         ap.add_argument('--interface-name',
                         default='eth0',