Expose maxscale starttime.

Maxinfo needs access to the time MaxScale was started.
Now exposed in a way similar to the uptime.

server/core/gateway.c

@@ -1291,7 +1291,7 @@ int main(int argc, char **argv)
     *maxlog_enabled = 1;
     *log_to_shm = 0;
 
-    maxscale_reset_uptime();
+    maxscale_reset_starttime();
 
     sigemptyset(&sigpipe_mask);
     sigaddset(&sigpipe_mask, SIGPIPE);

server/core/misc.c

@@ -20,14 +20,22 @@
 #include <maxscale.h>
 #include <time.h>
 
-static time_t maxscale_started;
+static time_t started;
 
 /**
  * Reset the start time from which the uptime is calculated.
  */
-void maxscale_reset_uptime(void)
+void maxscale_reset_starttime(void)
 {
-    maxscale_started = time(0);
+    started = time(0);
+}
+
+/**
+ * Return the time when MaxScale was started.
+ */
+time_t maxscale_started(void)
+{
+    return started;
 }
 
 /**
@@ -37,5 +45,5 @@ void maxscale_reset_uptime(void)
  */
 int maxscale_uptime()
 {
-    return time(0) - maxscale_started;
+    return time(0) - started;
 }