Keep awxkit's requirements on the setup.py

awxkit's setup.py was making use of pip internal structures to parse the
requirements.txt file. This is not a good thing as they may change,
actually that just happened.

To avoid this in the future, move the list of requirements to setup.py
and make requirements.txt list `.` as the only item. This way we keep a
single place to update requirements in the future and avoid accessing
pip's internals.

awxkit/requirements.txt

@@ -1,2 +1 @@
-PyYAML
-requests
+.

awxkit/setup.py

@@ -2,12 +2,6 @@ import os
 import glob
 import shutil
 from setuptools import setup, find_packages, Command
-try:  # for pip >= 10
-    from pip._internal.req import parse_requirements
-except ImportError:  # for pip <= 9.0.3
-    from pip.req import parse_requirements
-
-requirements = [str(r.req) for r in parse_requirements('requirements.txt', session=False)]
 
 
 def get_version():
@@ -66,7 +60,10 @@ setup(
         'clean': CleanCommand,
     },
     include_package_data=True,
-    install_requires=requirements,
+    install_requires=[
+        'PyYAML',
+        'requests',
+    ],
     python_requires=">=3.6",
     extras_require={
         'formatting': ['jq'],