peerd: Include privetd into peerd group.

Members of peerd allowed to send dbus traffic to org.chromium.peerd.

BUG=chromium:437071
TEST=check /etc/group on device to see if privetd in peerd group
CQ-DEPEND=CL:232108,CL:232141

Change-Id: I56452a0847cf4f6f126c2b7096e6eb55e8bc6540
Reviewed-on: https://chromium-review.googlesource.com/232134
Tested-by: Vitaly Buka <vitalybuka@chromium.org>
Reviewed-by: Christopher Wiley <wiley@chromium.org>
Commit-Queue: Vitaly Buka <vitalybuka@chromium.org>
diff --git a/profiles/base/accounts/group/peerd b/profiles/base/accounts/group/peerd
index 7a3cf5a..dd85bee 100644
--- a/profiles/base/accounts/group/peerd
+++ b/profiles/base/accounts/group/peerd
@@ -1,3 +1,3 @@
 group:peerd
 gid:260
-users:peerd
+users:peerd,privetd