pyOpenSSL isn't governed by semantic version, rather it uses date-bas…

…ed. For that reason, the normal ~= isn't appropriate.

src/azure-cli/setup.py

@@ -127,7 +127,7 @@
     'paramiko>=2.0.8,<3.0.0',
     'prompt_toolkit~=1.0,>=1.0.15',
     'pydocumentdb>=2.0.1,<3.0.0',
-    'pyOpenSSL~=19.0',
+    'pyOpenSSL>=17.1.0',
     'pytz==2019.1',
     'pyyaml~=5.1',
     'requests~=2.22',