Let the caller log info about successful privilege drop.

We don't want to log this in hastctl.

MFC after:	1 week

sbin/hastd/primary.c

@@ -850,6 +850,7 @@ hastd_primary(struct hast_resource *res)
 		cleanup(res);
 		exit(EX_CONFIG);
 	}
+	pjdlog_info("Privileges successfully dropped.");
 
 	/*
 	 * Create the guard thread first, so we can handle signals from the

sbin/hastd/secondary.c

@@ -414,6 +414,7 @@ hastd_secondary(struct hast_resource *res, struct nv *nvin)
 
 	if (drop_privs() != 0)
 		exit(EX_CONFIG);
+	pjdlog_info("Privileges successfully dropped.");
 
 	/*
 	 * Create the control thread before sending any event to the parent,

sbin/hastd/subr.c

@@ -184,7 +184,5 @@ drop_privs(void)
 	PJDLOG_VERIFY(getgroups(1, gidset) == 1);
 	PJDLOG_VERIFY(gidset[0] == pw->pw_gid);
 
-	pjdlog_info("Privileges successfully dropped.");
-
 	return (0);
 }