UAA gets lots of failed token requests

[forbushbl]

Summary

When a user leaves cf top running for a long period of time, their UAA refresh token will expire, however we've noticed that it keeps on trying to get a new token. When this occurs we see ~600 requests per minute to UAA's /oauth/token endpoint until the offending user kills their cf top process.

Steps to reproduce the issue

1. Login to Cloud Foundry cf login
2. Run cf top
3. Wait until the refresh token expires
   Result: You will see lots of errors being printed to UAA's logs with the message "Handling error: InvalidTokenException, Invalid refresh token expired at..."

Environment

• Windows
• cf-cli v6.43.0 and v6.50.0
• top v0.9.5