Have starter also set supplemental groups

We rely on these for resources accessed by some processes.

Change-Id: Idf22b6263ebc313c8abb63fe93bce2cc3ef24274
Signed-off-by: James Kuszmaul <james.kuszmaul@bluerivertech.com>
diff --git a/aos/starter/starterd_lib.h b/aos/starter/starterd_lib.h
index 1809326..8c70960 100644
--- a/aos/starter/starterd_lib.h
+++ b/aos/starter/starterd_lib.h
@@ -117,6 +117,7 @@
   std::string name_;
   std::string path_;
   std::vector<char *> args_;
+  std::string user_name_;
   std::optional<uid_t> user_;
   std::optional<gid_t> group_;