disable login for groups

We don't support logging in as groups, so disable the two accounts
setting the password field.

BUG=chromium:351759
TEST=None

Change-Id: Ib3bc7fcf4fdba3d27fc362a5665f8d79b7a94d7b
Reviewed-on: https://chromium-review.googlesource.com/195415
Reviewed-by: Chris Masone <cmasone@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
diff --git a/profiles/base/accounts/group/lighttpd b/profiles/base/accounts/group/lighttpd
index dd9727e..fb1e770 100644
--- a/profiles/base/accounts/group/lighttpd
+++ b/profiles/base/accounts/group/lighttpd
@@ -1,4 +1,3 @@
 group:lighttpd
-password:!
 gid:410
 users:
diff --git a/profiles/base/accounts/group/moblab b/profiles/base/accounts/group/moblab
index 1b7287d..c54da54 100644
--- a/profiles/base/accounts/group/moblab
+++ b/profiles/base/accounts/group/moblab
@@ -1,4 +1,3 @@
 group:moblab
 gid:246
-password:*
 users:moblab