Adding x509 support

[dynamikdev]

adding support for x509
create a specific authenticate_mongo_x509 as other mecanism

[coveralls]

Coverage decreased (-95.6%) to 0.0% when pulling 40e6be6 on dynamikdev:patch-1 into 49cd126 on twisted:master.

[IlyaSkriblovsky]

Wow, that was fast :)

Test failures seem not to be linked with this PR. They probably caused by recent changes in PyMongo.

Is it possible to add some tests for X509? Or it will be too tricky?
Existing tests for MONGODB-CR in tests/test_auth.py start distinct mongod process and create users for testing. May be we can start hardcode test keys in test_auth.py and start mongod with key-based authentication enabled?
But if this cannot be done in a clean way, it is probably to leave it without tests for now.

[dynamikdev]

too quickly , i made an error fixed
it quite tricky to test end2end the connection but , i could maybe check the request

[coveralls]

Coverage decreased (-18.06%) to 77.567% when pulling 1bd192a on dynamikdev:patch-1 into 49cd126 on twisted:master.

[IlyaSkriblovsky]

@dynamikdev Could you please rebase your PR onto current master to make sure it passes all the tests? (Currently the PR is marked as failing because master was broken)

[psi29a]

No need for a rebase, I just kicked travis-ci and it rebuilt the PR against master again. Looks green to me.

[IlyaSkriblovsky]

@psi29a Travis can reapply PR to current master (effectively, do a rebase)? Cool!

[psi29a]

Not a rebase, but it tries to merge to the latest master at that moment and if there are no merge conflicts, it builds. So I think we got lucky. :)

[IlyaSkriblovsky]

transformed into #187 and merged