fix setup.py (#1625)

Author: ofek

hdfs_namenode/setup.py

@@ -60,7 +60,6 @@ def get_requirements(fpath):
     install_requires=get_requirements('requirements.in') + [
         'datadog_checks_base',
     ],
-    setup_requires=['pytest-runner', ],
     tests_require=get_requirements('requirements-dev.txt'),
 
     # Extra files to ship with the wheel package