Products.PloneHotfix20121106 was fixed in 4.2.3, not 4.2.5.

According to https://pypi.python.org/pypi/Products.PloneHotfix20121106
the bugs were fixed in 4.2.3, so the hotfix is not required
for 4.2.3 and 4.2.4.

Thanks @fredvd for the hint
Fix wrong version in Plone version tests.

The description says 4.1.6, so we should also pass in 4.1.6.