Added CVE-2012-2686 module

Added Module for a DoS issue in OpenSSL (pre 1.0.1d). Can be exploited
with services that use TLS >= 1.1 and AES-NI. Because of improper
length computation, an integer underflow occurs leading to a
segmentation fault. This module brute-forces serveral encrypted
messages - when the decrypted message coincidentally specifies a
certain value for the size, the integer underflow occurs. Though this
could be accomplished more effectively (e.g. implementing or
maninpulating and TLS implementation), this module still does what it
should do.