Adding ippusb group overlay

BUG=chromium:768606
TEST=manually verify that group exists on device

Change-Id: I8ac6a4c6e616f83e822b0025615098ecb6739ae8
Reviewed-on: https://chromium-review.googlesource.com/791250
Commit-Ready: David Valleau <valleau@chromium.org>
Tested-by: David Valleau <valleau@chromium.org>
Reviewed-by: Chirantan Ekbote <chirantan@chromium.org>
diff --git a/profiles/base/accounts/group/ippusb b/profiles/base/accounts/group/ippusb
new file mode 100644
index 0000000..a91367b
--- /dev/null
+++ b/profiles/base/accounts/group/ippusb
@@ -0,0 +1,3 @@
+group:ippusb
+gid:20100
+users:lp,lpadmin,cups