Rename the PolicyManager to UpdateManager.

This change renames the PolicyManager class, directory, tests, etc,
to avoid confusion with libpolicy and its classes.

BUG=chromium:373551
TEST=emerged on link.
CQ-DEPEND=CL:I43081673c7ba409f02273197da7915537bde39c6

Change-Id: Iffa76caa3b95ecbbdba87ab01006d1d8ce35a27f
Reviewed-on: https://chromium-review.googlesource.com/201876
Tested-by: Alex Deymo <deymo@chromium.org>
Reviewed-by: David Zeuthen <zeuthen@chromium.org>
Commit-Queue: Alex Deymo <deymo@chromium.org>
diff --git a/update_manager/update_manager.conf.example b/update_manager/update_manager.conf.example
new file mode 100644
index 0000000..2d77974
--- /dev/null
+++ b/update_manager/update_manager.conf.example
@@ -0,0 +1,18 @@
+# Configuration file for the update-manager component of update_engine.
+#
+# Normally this file is loaded from /etc/update_manager.conf. If
+# running update_engine in developer mode (and only if running in
+# developer mode), we attempt to load
+#
+#  /mnt/stateful_partition/etc/update_manager.conf
+#
+# and use it if it exists. If it doesn't exist, we fall back to
+# /etc/update_manager.conf.
+#
+# Note: changes to this file are not automatically applied. Use the
+# command "restart update-engine" from a root shell to make your
+# changes take effect.
+
+# Set to true if the device supports the concept of OOBE
+# (Out-Of-the-Box-Experience), false if it doesn't.
+is_oobe_enabled=true