defaultServiceManager wait for service manager ready

If the service manager is not ready when we attempt to create a local
proxy, fail and retry.

Change-Id: I7d7300bc07cd70608793479aa3da282d066da7f6
diff --git a/libs/binder/IServiceManager.cpp b/libs/binder/IServiceManager.cpp
index 1750640..a341ca8 100644
--- a/libs/binder/IServiceManager.cpp
+++ b/libs/binder/IServiceManager.cpp
@@ -37,9 +37,11 @@
     
     {
         AutoMutex _l(gDefaultServiceManagerLock);
-        if (gDefaultServiceManager == NULL) {
+        while (gDefaultServiceManager == NULL) {
             gDefaultServiceManager = interface_cast<IServiceManager>(
                 ProcessState::self()->getContextObject(NULL));
+            if (gDefaultServiceManager == NULL)
+                sleep(1);
         }
     }