Dynamically manage service states based on user defined conditions

Old event system has been replaced with a more generic condition
concept. The idea is that finit plugins may provide arbitrary
conditions that services may specify as dependencies that they require
to run.

In order to accomodate this, the service management has been
redesigned to use a state machine.

conf.h

@@ -28,7 +28,7 @@
 
 void conf_parse_cmdline   (void);
 int  conf_parse_runlevels (char *runlevels);
-void conf_parse_events    (svc_t *svc, char *events);
+void conf_parse_cond      (svc_t *svc, char *cond);
 int  conf_parse_config    (void);
 void conf_reload_dynamic  (void);