Zope.mkzeoinstance

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- Add support for testing on Travis, and with tox.

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- Place the socket used by the ``zeoctl`` control process to conmmunicate
with its ``runzeo`` daemaon in ``$INSTANCE_HOME/var``, instead of
``$INSTANCE_HOME/etc`` (which would idealy not be writable by the process).
See: https://bugs.launchpad.net/zope.mkzeoinstance/+bug/175981

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- Rename the script / package ``mkzeoinstance`` to avoid clashing with the
script bundled with ZODB.

- Add an option to spell the host interface to be listened on, as well as
the port the generated ZEO server configuration. Thanks to Igor Stroh
for the patch. See: https://bugs.launchpad.net/zodb/+bug/143361

- Fix generated templates to cope with the move of ``zdaemon`` code into
its own project.

- Fork from the version of the ``mkzeoinst`` script contained in
ZODB 3.9.4.