rma: Add rmad group/user

RMA daemon is the backend controller for shimless RMA process state
transitions and RMA operations.

BUG=b:177639617
TEST=emerge-hatch rmad
TEST=check collision with display-accts.py --lint

Cq-Depend: chromium:2649988, chromium:2649838
Change-Id: Ia10fcf9f68caa1783bd2f6ec1c7aa009045dcad0
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/eclass-overlay/+/2649837
Reviewed-by: Kevin Lin <kevinptt@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Tested-by: Cheng-Han Yang <chenghan@chromium.org>
Commit-Queue: Cheng-Han Yang <chenghan@chromium.org>
diff --git a/profiles/base/accounts/group/rmad b/profiles/base/accounts/group/rmad
new file mode 100644
index 0000000..6fc3088
--- /dev/null
+++ b/profiles/base/accounts/group/rmad
@@ -0,0 +1,3 @@
+group:rmad
+gid:20176
+users:rmad
diff --git a/profiles/base/accounts/user/rmad b/profiles/base/accounts/user/rmad
new file mode 100644
index 0000000..4178571
--- /dev/null
+++ b/profiles/base/accounts/user/rmad
@@ -0,0 +1,6 @@
+user:rmad
+uid:20176
+gid:20176
+gecos:CrOS RMA daemon
+home:/dev/null
+shell:/bin/false