eclass-overlay: create seneschal-client group

BUG=b:123602808
TEST=Run ./profiles/base/accounts/display-accts.py, verify there are no
collisions.

Change-Id: Ia7dea82c14d9d9c89b521cc9f947ba27dd17cd42
Reviewed-on: https://chromium-review.googlesource.com/1453304
Commit-Ready: Dmitry Torokhov <dtor@chromium.org>
Tested-by: Dmitry Torokhov <dtor@chromium.org>
Reviewed-by: Stephen Barber <smbarber@chromium.org>
Reviewed-by: Chirantan Ekbote <chirantan@chromium.org>
diff --git a/profiles/base/accounts/group/seneschal-client b/profiles/base/accounts/group/seneschal-client
new file mode 100644
index 0000000..d22c52c
--- /dev/null
+++ b/profiles/base/accounts/group/seneschal-client
@@ -0,0 +1,6 @@
+# Group for ownership of /run/seneschal/9p-client which will
+# hold UNIX sockets for VM plugin communication with the 9P
+# server (9s) started by seneschal.
+group:seneschal-client
+gid:417
+users:seneschal,crosvm