Remove PyTest command from setup.py

Now that direct execution of setup.py is deprecated, we shouldn't have
a custom setuptools command to run tests. Testing the package can be
done by running pytest directly, typically from within tox. Accordingly,
I'm removing the PyTest command from setup.py in this commit.

Author: diazona

setup.py

@@ -1,4 +1,3 @@
-from setuptools import Command
 from setuptools import setup
 
 
@@ -10,23 +9,6 @@ def read(fname):
     return open(os.path.join(_here, fname)).read()
 
 
-class PyTest(Command):
-    user_options = []
-
-    def initialize_options(self):
-        pass
-
-    def finalize_options(self):
-        pass
-
-    def run(self):
-        import subprocess
-        import sys
-
-        errno = subprocess.call([sys.executable, "runtests.py"])
-        raise SystemExit(errno)
-
-
 setup(
     name="pytest-localserver",
     author="Sebastian Rahlf",
@@ -45,7 +27,6 @@ def run(self):
             "aiosmtpd",
         ],
     },
-    cmdclass={"test": PyTest},
     tests_require=["pytest>=2.0.0", "requests"],
     entry_points={"pytest11": ["localserver = pytest_localserver.plugin"]},
     zip_safe=False,