Revert "add ntp servers on eeden.esams, rubidium (rt #7101)"

This reverts commit c877ffc661a645e6e1f9bf208bb6e6598fdcdeed.

Turns out the authdns base class includes standard which includes ntp::client, making this changeset broken.  Need to think about this more.

Change-Id: I568c1c4e1f757994266cda3e1980a52e2b437d25