Cleanup Bogus Errors

[nvidianz]

Removed several bogus errors:

1. Error processing frame: RuntimeError: cannot schedule new futures after shutdown
   This can happen when the message arrives for a cell already being shutdown. Changed it to debug.
2. Logical Error: Endpoint is already removed
   This is actually not an error. The weak-ref set entry can be removed when the ref is gone. Changed it to debug.
3. Added name to several threads to help debugging the dangling thread issue.

Types of changes

• Non-breaking change (fix or new feature that would not break existing functionality).
• Breaking change (fix or new feature that would cause existing functionality to change).
• New tests added to cover the changes.
• Quick tests passed locally by running ./runtest.sh.
• In-line docstrings updated.
• Documentation updated.

[nvidianz]

/build

[nvidianz]

/build

[nvidianz]

/build