Add fast reverse proxy (frp) fingerprints

[mkienow-r7]

Description

Adds 3 fast reverse proxy (frp) fingerprints.

Notes

Fingerprinted frp version 0.48.0.

• favicon.ico

  $ file favicon.ico
  favicon.ico: MS Windows icon resource - 1 icon, 48x48, 32 bits/pixel
  $ md5 favicon.ico
  MD5 (favicon.ico) = 57801ef5135f6a6e8ea69baef85f8607

Motivation and Context

Improved coverage

How Has This Been Tested?

• bundle exec ./bin/recog_verify xml/favicons.xml xml/html_title.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.