Add "slow_start" keyword to init

This keyword will cause init to wait a few seconds before exec'ing
the target binary.  Maybe only useful for hacks and debugging.

Change-Id: I85caa0bcbc0be7e48bd21eb9e31e039c0740c8d5
diff --git a/init/init_parser.c b/init/init_parser.c
index d136c28..1b7522c 100644
--- a/init/init_parser.c
+++ b/init/init_parser.c
@@ -131,6 +131,7 @@
         if (!strcmp(s, "etkey")) return K_setkey;
         if (!strcmp(s, "etprop")) return K_setprop;
         if (!strcmp(s, "etrlimit")) return K_setrlimit;
+        if (!strcmp(s, "low_start")) return K_slow_start;
         if (!strcmp(s, "ocket")) return K_socket;
         if (!strcmp(s, "tart")) return K_start;
         if (!strcmp(s, "top")) return K_stop;
@@ -564,6 +565,9 @@
     case K_critical:
         svc->flags |= SVC_CRITICAL;
         break;
+    case K_slow_start:
+        svc->flags |= SVC_SLOW_START;
+        break;
     case K_setenv: { /* name value */
         struct svcenvinfo *ei;
         if (nargs < 2) {