[mythtv] WARNING - CVS drops DVB tables

[Nigel Pearson]

	Running CVS frontend on a 0.16 backend seems to do this:

DROP TABLE IF EXISTS dvb_channel
DROP TABLE IF EXISTS dvb_pids
DROP TABLE IF EXISTS dvb_sat

after creating dtv_multiplex. Now, this would be fine
if the machine was CVS-only, but if you happen to test
against a working DVB backend, you will break it.

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