| The extras.d directory contains project initialization scripts to be | 
 | sourced by stack.sh at the end of its run.  This is expected to be | 
 | used by external projects that want to be configured, started and | 
 | stopped with DevStack. | 
 |  | 
 | Order is controlled by prefixing the script names with the a two digit | 
 | sequence number.  Script names must end with '.sh'.  This provides a | 
 | convenient way to disable scripts by simoy renaming them. | 
 |  | 
 | DevStack reserves the sequence numbers 00 through 09 and 90 through 99 | 
 | for its own use. | 
 |  | 
 | The scripts are called with an argument of 'stack' by stack.sh and | 
 | with an argument of 'unstack' by unstack.sh. |