tests: Use t-debchange in some places instead of dch

Raw dch can hang reading stdin for confirmation because we forgot to
set DEBEMAIL.

Empirically it works some of the time.  Maybe the parallel test
ordering connects only some of the tests' stdin to the terminal, or
something.

Anyway, we have t-debchange and so we should be using it.

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

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