This commit changes how os_name and os_flavor are handled
for client-side exploits, matching recent changes to the
server-side exploits and scanner fingerprints.
This commit also updates the client-side fingerprinting to
take into account Windows 8.1 and IE 9, 10, and 11.
HD Moore
jvazquez-r7
Tod Beardsley
Tab Assassin
sinn3r
jvazquez-r7