Xfail the mitmproxy / pyOpenSSL dependency conflict

This is already fixed in master:
https://github.com/mitmproxy/mitmproxy/pull/2435

So it'll hopefully in the next release.

Because the pyOpenSSL package name and requirement name do not match we
also add code to lower the name for comparison.

Also the check-uc only complains about a single issue but there are 3.

Change-Id: I6657802908ac4052eeb6c73fb03098b0c3557eb2

openstack_requirements/cmds/check_conflicts.py

@@ -58,15 +58,15 @@ def main():
                     if req.markers in ["", pyver]:
                         pkg_resources.require(name)
         except pkg_resources.ContextualVersionConflict as e:
-
             if e.dist.key in xfails:
                 xfail_requirement = xfails[e.dist.key][0][0]
                 xfail_blacklists = set(xfail_requirement.markers.split(','))
                 conflict = e.dist.as_requirement()
                 conflict_specifiers = ''.join(conflict.specs[0])
+                conflict_name = conflict.name.lower()
 
                 if (e.required_by.issubset(xfail_blacklists) and
-                        xfail_requirement.package == conflict.name and
+                        xfail_requirement.package == conflict_name and
                         conflict_specifiers == xfail_requirement.specifiers):
 
                     print ('XFAIL while checking conflicts '

upper-constraints-xfails.txt

@@ -1,2 +1,5 @@
 # Format is
 # <dependency that is incompatible>==<version>;<list,of,affected,packages>
+pyopenssl==17.2.0;mitmproxy
+pyasn1==0.3.3;mitmproxy
+cryptography==2.0.3;mitmproxy