Add option to log service/task output to the console

Example:
    service log:console [2] /usr/sbin/udhcpd -f -- DHCP Server

Signed-off-by: Robert Andersson <robert.m.andersson@se.atlascopco.com>

docs/config.md

@@ -350,6 +350,7 @@ syslog using the native `logit` tool.  The full syntax is:
 
     log:/path/to/file
     log:prio:facility.level,tag:ident
+    log:console
     log:null
     log
 

src/service.c

@@ -139,7 +139,7 @@ static int is_norespawn(void)
  * @svc: Service to start
  *
  * Returns:
- * 0 if the service was successfully started. Non-zero otherwise. 
+ * 0 if the service was successfully started. Non-zero otherwise.
  */
 static int service_start(svc_t *svc)
 {
@@ -243,6 +243,9 @@ static int service_start(svc_t *svc)
 				redirect_null();
 				goto logit_done;
 			}
+			if (svc->log.console) {
+				goto logit_done;
+			}
 
 			/*
 			 * Open PTY to connect to logger.  A pty isn't buffered
@@ -466,7 +469,7 @@ static int service_stop(svc_t *svc)
  *
  * This function does some basic checks of the runtime state of Finit
  * and a sanity check of the @svc before sending %SIGHUP.
- * 
+ *
  * Returns:
  * POSIX OK(0) or non-zero on error.
  */
@@ -558,6 +561,8 @@ static void parse_log(svc_t *svc, char *arg)
 			svc->log.enabled = 1;
 		else if (!strcmp(tok, "null") || !strcmp(tok, "/dev/null"))
 			svc->log.null = 1;
+		else if (!strcmp(tok, "console") || !strcmp(tok, "/dev/console"))
+			svc->log.console = 1;
 		else if (tok[0] == '/')
 			strlcpy(svc->log.file, tok, sizeof(svc->log.file));
 		else if (!strcmp(tok, "priority") || !strcmp(tok, "prio"))

src/svc.h

@@ -119,6 +119,7 @@ typedef struct svc {
 	struct {
 		char   enabled;
 		char   null;
+		char   console;
 		char   file[64];
 		char   prio[20];
 		char   ident[20];