Added bindings for SSL_renegotiate_<pending/abbreviated>

[kjav]

This is to facilitate their use in the pyopenssl library.

[kjav]

Related to issue #2300

[alex]

Jenkins, ok to test.

[reaperhulk]

jenkins, ok to test

[kjav]

@alex, I have a fork of the pyopenssl library which uses these bindings to add renegotiation functionality. When should I create the merge request? I'm worried the tests will fail as the cryptography version it uses might not be up to date with the changes in this merge.

[reaperhulk]

Once this merges you can open a PR against pyopenssl. There are tests there that run against cryptography master. The tests against the latest release version will fail, but that's expected for now.

[alex]

I don't think SSL_renegotiate_abbreviated exists in all versions of OpenSSL?

[kjav]

Do you have an example?

[reaperhulk]

Looks like it was added sometime in 1.0.1 so that'll have to be conditionally bound. @kjav look at the jenkins status check on this PR right now if you want to see where it's failing.

[kjav]

I added this binding on a whim - it is not required for the pyopenssl renegotiation support (the reason for this merge). I have removed it.

[codecov-io]

Current coverage is 99.98%

Merging #2303 into master will not affect coverage as of 157b529

@@            master   #2303   diff @@
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  Files          115     115       
  Stmts        11950   11950       
  Branches      1334    1334       
  Methods          0       0       
======================================
  Hit          11948   11948       
  Partial          2       2       
  Missed           0       0       

Review entire Coverage Diff as of 157b529

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[kjav]

The checks have passed - can this be merged with master?