Refactor, use new iwatch module for inotify of Finit *.conf files

- Use iwatch, modeled after pidfile plugin
- Use one .conf watcher for all *.conf paths/files
- Use full path of conf file for changes, from realpath().
  This fixes a long-standing limitation on unique filenames
  for services, that absolutely nobody knew about

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

src/conf.h

@@ -34,11 +34,11 @@ extern struct rlimit global_rlimit[];
 int   str2rlim(char *str);
 char *rlim2str(int rlim);
 
-int  conf_init            (void);
+int  conf_init            (uev_ctx_t *ctx);
 void conf_reload          (void);
 int  conf_any_change      (void);
 int  conf_changed         (char *file);
-int  conf_monitor         (uev_ctx_t *ctx);
+int  conf_monitor         (void);
 
 void conf_parse_cmdline   (int argc, char *argv[]);
 int  conf_parse_runlevels (char *runlevels);