Rollup of recent fingerprint changes & additions

[hdm]

Description

This is a roll-up PR of changes we have accumulated since December. The big ones:

1. Rename Terminal Server to Device Server for consistency across fingerprints.
2. Major updates to IP Phone, VoIP bridges, and video conferencing signatures
3. A scattering of small typo fixes and signature improvements
4. Clarification that the http_servers.xml is also used for SIP and RTSP
5. Fix missing NetScaler/Pulse VPN detection by HTTP Cookie

Motivation and Context

Consistency and improved coverage across the board

How Has This Been Tested?

Real-world testing (shipping in Rumble since December) along with rspec and the recog_verify script.

Types of changes

See above

Checklist:

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

[hdm]

Closing this for now, will re-pull as a sip_banners.xml PR and then a second for RTSP and the others.