eclass-overlay/profiles: add wpan system accounts

BUG=b:121291782
TEST=None

Change-Id: I9bfbe4ebfe848d7f4a35da6ccc41075e85c2ccd9
Reviewed-on: https://chromium-review.googlesource.com/1477090
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Yakun Xu <xyk@google.com>
Reviewed-by: Yakun Xu <xyk@google.com>
Reviewed-by: Chirantan Ekbote <chirantan@chromium.org>
diff --git a/profiles/base/accounts/group/wpan b/profiles/base/accounts/group/wpan
new file mode 100644
index 0000000..2cfc6cf
--- /dev/null
+++ b/profiles/base/accounts/group/wpan
@@ -0,0 +1,3 @@
+group:wpan
+gid:20133
+users:
diff --git a/profiles/base/accounts/user/wpan b/profiles/base/accounts/user/wpan
new file mode 100644
index 0000000..f5b6956
--- /dev/null
+++ b/profiles/base/accounts/user/wpan
@@ -0,0 +1,6 @@
+user:wpan
+uid:20133
+gid:20133
+gecos:Thread network interface daemon
+home:/dev/null
+shell:/bin/false