Use Testsuite: autopkgtest-pkg-perl
Recent versions of autodep8 will append our debian/tests/control to the one they generate, so we no longer need to replicate what autodep8 would have produced.
d/tests/pkg-perl/smoke-files: The makesite test needs an extra file copied
Fixes: 278d8ae4 "Fix the test suite to work when ikiwiki-hosting is not installed"
d/control: Depend on python3-docutils instead of python-docutils
This catches up with the corresponding change to ikiwiki's Suggests in version 3.20180105-1.
Also explicitly depend on python3, again matching ikiwiki's Suggests.
Closes: #945656
Branch: https://git.pseudorandom.co.uk/smcv/ikiwiki-hosting.git/shortlog/refs/heads/deb-packaging
--smcv