Call selinux_status_open() prior to use of selinux_status_updated().

The selinux_status_*() interfaces require calling selinux_status_open()
first.  Since this was not being called by servicemanager, the
selinux_status_updated() call was always failing and servicemanager
was not reloading service_contexts upon a policy reload.

(cherrypicked from commit bea0746b24)

Change-Id: I6ac62e114bbca99c5f0999feb918fcde15009274
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>

cmds/servicemanager/service_manager.c

@@ -361,6 +361,7 @@ int main(int argc, char **argv)
 
     selinux_enabled = is_selinux_enabled();
     sehandle = selinux_android_service_context_handle();
+    selinux_status_open(true);
 
     if (selinux_enabled > 0) {
         if (sehandle == NULL) {