add requirements.txt.python3.7.3 to fix broken debian/ubuntu docker build...

add requirements.txt.python3.7.3 to fix broken debian/ubuntu docker build because of too new importlib-metadata==5.0.0

requirements.txt.python3.7.3

+setuptools==59.1.1
+argparse
+cl
+celery==5.2.3
+django-admin
+django-picklefield==2.0
+django-registration==3.1.2
+djangorestframework==3.12.0
+django-tinymce
+django-form-utils
+django-settings-export
+Django==2.2.28
+gevent
+greenlet
+gunicorn
+kombu==5.2.3
+lxml
+mailer
+mysqlclient
+ncclient
+paramiko
+pycrypto
+pyparsing
+python-dateutil
+python-memcached
+PyYAML
+#wsgiref
+six
+requests
+pysnmp
+ply
+ipaddress
+idna
+appdirs
+anyjson
+cryptography
+redis
+pytest==6.2.5
+pytest-django==4.4.0
+psutil
+longerusername
+intervaltree
+importlib-metadata==4.13.0