Create lpadmin service user.

We need a service user to and and remove printers from CUPS
but which can't modify any files.

BUG=chromium:633382
TEST='id lpadmin' returns values.
CQ-DEPEND=I15eda88deb9cbf517a29ee5e90d393e6c244c86e
CQ-DEPEND=CL:*277562

Change-Id: I0f095d7f7566a6b9438e359c3aa54a01b9a37ac8
Reviewed-on: https://chromium-review.googlesource.com/370677
Commit-Ready: Sean Kau <skau@chromium.org>
Tested-by: Sean Kau <skau@chromium.org>
Reviewed-by: Brian Norris <briannorris@chromium.org>
diff --git a/profiles/base/accounts/group/lp b/profiles/base/accounts/group/lp
index 2b58ac3..0e17761 100644
--- a/profiles/base/accounts/group/lp
+++ b/profiles/base/accounts/group/lp
@@ -1,3 +1,3 @@
 group:lp
 gid:7
-users:lp,cups,chronos
+users:lp,lpadmin,cups,chronos
diff --git a/profiles/base/accounts/group/lpadmin b/profiles/base/accounts/group/lpadmin
index 3109afc..d663276 100644
--- a/profiles/base/accounts/group/lpadmin
+++ b/profiles/base/accounts/group/lpadmin
@@ -1,3 +1,3 @@
 group:lpadmin
 gid:269
-users:chronos,cups
+users:chronos,cups,lpadmin
diff --git a/profiles/base/accounts/user/lpadmin b/profiles/base/accounts/user/lpadmin
new file mode 100644
index 0000000..e1bd378
--- /dev/null
+++ b/profiles/base/accounts/user/lpadmin
@@ -0,0 +1,6 @@
+user:lpadmin
+uid:269
+gid:269
+gecos:CUPS admin service user for running lpadmin
+home:/dev/null
+shell:/bin/false