Add gdb python plugin which analyzes coredump for vulnerability

Usage:
Run abrt-action-analyze-vulnerability in a directory which contains
./coredump file.
If crash looks exploitable, the tool creates ./exploitable file.
Example of such a file:

"""
Likely crash reason: Write to an invalid address
Exploitable rating (0-9 scale): 6
"""

This patch adds abrt-action-analyze-vulnerability invocation to
"EVENT=post-create analyzer=CCpp".

V2: switched to regexps; i18n of messages

TODO:
* instruction analyzer is x86 specific now, make it per-arch

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
Signed-off-by: Martin Milata <mmilata@redhat.com>
specfile: hook up vulnerability analyzer

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
Signed-off-by: Martin Milata <mmilata@redhat.com>