tpm_manager: add tpm_manager user and group to eclass-overlay.

BUG=brillo:1127
TEST=tpm_managerd runs on DUT as tpm_manager user

Change-Id: If696cef9e2af3a62019c43f3f07fa310c6cdf51d
Reviewed-on: https://chromium-review.googlesource.com/273280
Trybot-Ready: Utkarsh Sanghi <usanghi@chromium.org>
Tested-by: Utkarsh Sanghi <usanghi@chromium.org>
Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
Commit-Queue: Utkarsh Sanghi <usanghi@chromium.org>
diff --git a/profiles/base/accounts/group/tpm_manager b/profiles/base/accounts/group/tpm_manager
new file mode 100644
index 0000000..a1c683f
--- /dev/null
+++ b/profiles/base/accounts/group/tpm_manager
@@ -0,0 +1,3 @@
+group:tpm_manager
+gid:252
+users:tpm_manager
diff --git a/profiles/base/accounts/user/tpm_manager b/profiles/base/accounts/user/tpm_manager
new file mode 100644
index 0000000..91dc750
--- /dev/null
+++ b/profiles/base/accounts/user/tpm_manager
@@ -0,0 +1,6 @@
+user:tpm_manager
+uid:252
+gid:252
+gecos:Chromium OS tpm_manager daemon runs as this user
+home:/dev/null
+shell:/bin/false