Directory for master/slave initialization scripts:
 * Only executable files with a .run suffix are used

 * The twinstar-corosync-bridge run them via symlinks in
   /usr/share/twinstar/run.d

 * The can be blocking. Thw twinstar-corosync-bridge maintain
   a state machine and start them one, by one.

 * When we become "master":
   - They are executed in lexical order
   - With a single parameter: "start"

 * When we become "slave":
   - They are executed in *reverse* lexical order
   - With a single parameter: "stop"
