Web UI tests were marked as tier1 tests.

The tier system is intended to be used together with CI system
to make sure the more complicated tests are being run only
when all of the basic functionality is working.

The system is using pytest's marker system. E.g. an invocation of
all tier1 tests with listing will look like:

    $ py.test -v -m tier1 ipatests

or in case of out of tree tests:

    $ ipa-run-tests -m tier1

Reviewed-By: Ales 'alich' Marecek <amarecek@redhat.com>

The six way of doing this is to replace all occurences of "unicode"
with "six.text_type". However, "unicode" is non-ambiguous and
(arguably) easier to read. Also, using it makes the patches smaller,
which should help with backporting.

Reviewed-By: Petr Viktorin <pviktori@redhat.com>

Use basic math rather than timezone conversion to get
minutes and seconds.
Break out the message generation into a small tested function.

https://fedorahosted.org/freeipa/ticket/4242

Reviewed-By: Rob Crittenden <rcritten@redhat.com>

Nose doesn't pick up directories that don't begin with 'test'.
Rename ipatests/test_ipaserver/install to test_install so that it's run.

Also, merge test_ipautil.py from ipapython/test into tests/test_ipapython,
so the whole test suite is in one place.