arc-keymaster: add daemon user and group

BUG=b:110136496
TEST=manual - run display-accts.py, see arc-keymasterd user/group

Change-Id: Idb10121db6f9c210b5560298886f826eb4f1379f
Reviewed-on: https://chromium-review.googlesource.com/1099170
Commit-Ready: Edman Anjos <edman@chromium.org>
Tested-by: Edman Anjos <edman@chromium.org>
Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
diff --git a/profiles/base/accounts/group/arc-keymasterd b/profiles/base/accounts/group/arc-keymasterd
new file mode 100644
index 0000000..1f24499
--- /dev/null
+++ b/profiles/base/accounts/group/arc-keymasterd
@@ -0,0 +1,3 @@
+group:arc-keymasterd
+gid:20132
+users:
diff --git a/profiles/base/accounts/user/arc-keymasterd b/profiles/base/accounts/user/arc-keymasterd
new file mode 100644
index 0000000..dd5c556
--- /dev/null
+++ b/profiles/base/accounts/user/arc-keymasterd
@@ -0,0 +1,6 @@
+user:arc-keymasterd
+uid:20132
+gid:20132
+gecos:CrOS Keymaster daemon
+home:/dev/null
+shell:/bin/false