Log how long it takes to start more netd components.

This allows us to catch issues such as:

03-27 05:46:16.268   398   398 I Netd    : Registering NetdNativeService: 1005.5ms

Bug: 34873832
Test: bullhead builds, boots
Test: observed log messages on boot
Change-Id: I69a33affa2379a206c6a8d76b481913a248a715d
diff --git a/server/main.cpp b/server/main.cpp
index 4cc5838..8d0aa1c 100644
--- a/server/main.cpp
+++ b/server/main.cpp
@@ -113,11 +113,13 @@
         exit(1);
     }
 
+    Stopwatch subTime;
     status_t ret;
     if ((ret = NetdNativeService::start()) != android::OK) {
         ALOGE("Unable to start NetdNativeService: %d", ret);
         exit(1);
     }
+    ALOGI("Registering NetdNativeService: %.1fms", subTime.getTimeAndReset());
 
     /*
      * Now that we're up, we can respond to commands. Starting the listener also tells
@@ -127,6 +129,7 @@
         ALOGE("Unable to start CommandListener (%s)", strerror(errno));
         exit(1);
     }
+    ALOGI("Starting CommandListener: %.1fms", subTime.getTimeAndReset());
 
     write_pid_file();