biod: add biod to daemon-store group

Add biod to daemon-store group so that it can write to /home/root/
<hash of user id>/biod.

TEST=autotest security_AccountsBaseline
BUG=chromium:629657

CQ-DEPEND=CL:413024

Change-Id: I43d1a27eca786afa4b7d40858053a81ba3278caa
Reviewed-on: https://chromium-review.googlesource.com/411914
Commit-Ready: Mengqi Guo <mqg@chromium.org>
Tested-by: Mengqi Guo <mqg@chromium.org>
Reviewed-by: Dmitry Torokhov <dtor@chromium.org>
diff --git a/profiles/base/accounts/group/daemon-store b/profiles/base/accounts/group/daemon-store
index ce4a369..56f6fa3 100644
--- a/profiles/base/accounts/group/daemon-store
+++ b/profiles/base/accounts/group/daemon-store
@@ -1,3 +1,3 @@
 group:daemon-store
 gid:400
-users:chaps
+users:chaps,biod