Revert new experimental libev backend due to time constraints

Due to time constraints I had to revert the new libev backend to the
service, I/O and signals monitor.  Employed instead is the tried and
tested signals based service monitor, with a small extension for an
additional I/O monitor using poll() for the I/O plugins to use.

Tried restoring the startx finit.conf directive on top of the service
implementation. However, it's currently not usable to run /usr/bin/startx
for any other user than root. I recommend using the examples/finit.conf
and run /usr/sbin/gdm instead.

finit.c:
        New run_loop() function, replaces libev ev_run().

helpers.c:
        Refactor start_process() into svc_start().

plugin.c:
        Add fds[] array for use in the io_monitor() called by the
        new run_loop().

signal.c:
        Ignore SIGCHLD. Handled by waitpid() in svc_monitor() now,
        which is called by the new run_loop().

svc.c:
        svc_register(): Optional @username parsing for the command line.
        svc_monitor(): Replaced libev callback with waitpid()
        svc_start(): Refactored to use most of helpers.c:start_process()

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

svc.h

@@ -42,6 +42,8 @@ typedef enum {
 #define FINIT_SHM_ID     0x494E4954  /* "INIT", see ascii(7) */
 #define MAX_ARG_LEN      64
 #define MAX_STR_LEN      64
+#define MAX_USER_LEN     16
+#define MAX_NUM_FDS      64	     /* Max number of I/O plugins */
 #define MAX_NUM_SVC      64	     /* Enough? */
 #define MAX_NUM_SVC_ARGS 16
 
@@ -55,6 +57,7 @@ typedef struct svc {
 	char	       cmd[MAX_ARG_LEN];
 	char	       args[MAX_NUM_SVC_ARGS][MAX_ARG_LEN];
 	char	       descr[MAX_STR_LEN];
+	char           username[MAX_USER_LEN];
 	/* Public */
 	int	       delayed_reload; /* For external service plugin. */
 	plugin_svc_t  *plugin;
@@ -94,7 +97,7 @@ svc_t    *svc_find_by_id    (int id);
 svc_t    *svc_find_by_name  (char *name);
 svc_t    *svc_iterator      (int restart);
 
-int       svc_register      (char *line);
+int       svc_register      (char *line, char *username);
 int       svc_id_by_name    (char *name);
 svc_cmd_t svc_enabled	    (svc_t *svc, int dynamic);
 int       svc_start         (svc_t *svc);
@@ -102,6 +105,7 @@ int       svc_start_by_name (char *name);
 int       svc_stop          (svc_t *svc);
 int       svc_reload        (svc_t *svc);
 void      svc_start_all     (void);
+void      svc_monitor       (void);
 
 #endif	/* FINIT_SVC_H_ */