Add Amazon OpenSearch fingerprints

Description

Adds 3 Amazon OpenSearch fingerprints.

Notes

<link rel="shortcut icon" href="/ui/favicons/favicon.ico"/>

$ file favicon.ico
favicon.ico: MS Windows icon resource - 3 icons, 48x48, 32 bits/pixel, 32x32, 32 bits/pixel
$ md5 favicon.ico
MD5 (favicon.ico) = 13693d9673576eee0341b65f1697a376

<link rel="icon" type="image/png" sizes="32x32" href="/ui/favicons/favicon-32x32.png"/>

$ file favicon-32x32.png
favicon-32x32.png: PNG image data, 32 x 32, 8-bit colormap, non-interlaced
$ md5 favicon-32x32.png
MD5 (favicon-32x32.png) = c21973630a0986ce0bd703e69ff09491

<link rel="icon" type="image/png" sizes="16x16" href="/ui/favicons/favicon-16x16.png"/>

$ file favicon-16x16.png
favicon-16x16.png: PNG image data, 16 x 16, 8-bit colormap, non-interlaced
$ md5 favicon-16x16.png
MD5 (favicon-16x16.png) = 91b8256f84bcb7c5c87493f652f1d191

Motivation and Context

Improved coverage

How Has This Been Tested?

bundle exec ./bin/recog_verify xml/favicons.xml xml/html_title.xml xml/http_wwwauth.xml
rake tests

Types of changes

New feature (non-breaking change which adds functionality)

Checklist:

[x] I have updated the documentation accordingly (or changes are not required).
[x] I have added tests to cover my changes (or new tests are not required).
[x] All new and existing tests passed.

rapid7 / recog