Test test_03_skipmsgs.py fails with pytest 4.2.0 and newer

[RKrahl]

When running the test suite with pytest 4.2.0 or newer, test test_03_skipmsgs.py fails.

The cause is the following: This test is supposed to check the skip messages generated from pytest-dependency. It searches lines matching something like SKIP * test_c depends on test_b in the test output. But in pytest 4.2.0 the corresponding line in the test output has been changed from

SKIP [1] [...]/pytest_dependency.py:88: test_c depends on test_b

to

SKIPPED [1] [...]/pytest_dependency.py:88: test_c depends on test_b

I believe the relevant change in pytest was in pytest-dev/pytest#4668.