Don't write log messages to the umbilical pipe if we don't detach.

If we run in the foreground and are started by the CLI, this would
otherwise cause the first few log messages to appear twice.

src/logger.c

@@ -26,6 +26,7 @@
 #include "logger.h"
 #include "connection.h"
 #include "control_common.h"
+#include "process.h"
 #include "sptps.h"
 
 debug_t debug_level = DEBUG_NOTHING;
@@ -80,7 +81,7 @@ static void real_logger(int level, int priority, const char *message) {
 				break;
 		}
 
-		if(umbilical) {
+		if(umbilical && do_detach) {
 			write(umbilical, message, strlen(message));
 			write(umbilical, "\n", 1);
 		}

src/sptps_speed.c

@@ -33,6 +33,7 @@ bool send_request(void *c, const char *msg, ...) { return false; }
 struct list_t *connection_list = NULL;
 bool send_meta(void *c, const char *msg , int len) { return false; }
 char *logfilename = NULL;
+bool do_detach = false;
 struct timeval now;
 
 static bool send_data(void *handle, uint8_t type, const void *data, size_t len) {

src/sptps_test.c

@@ -35,6 +35,7 @@ bool send_request(void *c, const char *msg, ...) { return false; }
 struct list_t *connection_list = NULL;
 bool send_meta(void *c, const char *msg , int len) { return false; }
 char *logfilename = NULL;
+bool do_detach = false;
 struct timeval now;
 
 static bool verbose;