Drop OpenSSL 0.9.8 (#2978)

* Drop OpenSSL 0.9.8

* Drop this test, it's not relevant any longer

* unused import

* Remove CRYPTOGRAPHY_ALLOW_OPENSSL_098=1 from our tox

* removed unused code for Cryptography_HAS_PKEY_CTX

* return unused code for _AESCTRCipherContext

* syntax :-(

* remove some unused tests and skips

* remove unused code for Cryptography_HAS_PBKDF2_HMAC

* Revert "return unused code for _AESCTRCipherContext"

This reverts commit 7d149729205aa4c9735eb322414b167a75b302df.

* Remove unused RSA code

* Remove unused test code for conditional bindings

* Remove unused dsa code

* unused import

* Remove unused x509 extension code

* Remove unused EC code

* Attempt to remove unused DER key loading code

* document this

* grammar

* Added back this paragraph

* Update docs
diff --git a/docs/faq.rst b/docs/faq.rst
index 76dc4f3..2ddc5db 100644
--- a/docs/faq.rst
+++ b/docs/faq.rst
@@ -40,8 +40,8 @@
 appear to be at fault, it's possible that this is a bug in ``cryptography``.
 Please file an `issue`_ with instructions on how to reproduce it.
 
-Importing cryptography causes a ``RuntimeError`` about OpenSSL 0.9.8
---------------------------------------------------------------------
+Installing cryptography with OpenSSL 0.9.8 fails
+------------------------------------------------
 
 The OpenSSL project has dropped support for the 0.9.8 release series. Since it
 is no longer receiving security patches from upstream, ``cryptography`` is also
@@ -49,9 +49,9 @@
 version of OpenSSL (1.0.1 or later). This may require you to upgrade to a newer
 operating system.
 
-For the 1.4 release, you can set the ``CRYPTOGRAPHY_ALLOW_OPENSSL_098``
-environment variable. Please note that this is *temporary* and will be removed
-in ``cryptography`` 1.5.
+In ``cryptography`` 1.4, you can set the ``CRYPTOGRAPHY_ALLOW_OPENSSL_098``
+environment variable. Please note that this is *temporary* and is removed in
+``cryptography`` 1.5.
 
 .. _`NaCl`: https://nacl.cr.yp.to/
 .. _`PyNaCl`: https://pynacl.readthedocs.io