Guest ingests should not include IP Address as part of Guest Principal name

[coyotesqrl]

This is a duplicate of this Jira issue for testing purposes

The Guest Principal is created with a name of the form Guest@[IP_ADDR] which leaks information about Guest access when files are ingested and the PoC field is filled in. We should obfuscate the IP Addresses of Guest Principals.

• Update the STS Guest Validator to set the Principal name to Guest@[RANDOM]
• Write a security audit record of the form Mapping IP Addr [XXXX] to Internal ID [200f7e55Xda24X4ec3X8e9fX2bad7393fd53]
• Prevent a small secondary issue where Guest@ is sometimes prepended twice to the id on the principal's name
• Cache the generated token for a reasonable period so it can be reused instead of a new random id being created and logged on each Guest access