python-pytest: 3.4.1 -> 3.4.2

1.Upgrade python-pytest from 3.4.1 to 3.4.2.
2.Modify pytest_version_fix.patch, since the data has been changed.

Signed-off-by: Huang Qiyu <huangqy.fnst@cn.fujitsu.com>

meta-python/recipes-devtools/python/python-pytest/pytest_version_fix.patch

@@ -36,7 +36,7 @@ Index: pytest-3.2.2/setup.py
 +        return version_match.group(1)
 +    raise RuntimeError("Unable to find version string.")
  
- def has_environment_marker_support():
+ def get_environment_marker_support_level():
      """
 @@ -59,9 +72,7 @@ def main():
          name='pytest',