tcp: Catch exceptions on recv

[BrianJKoopman]

Description

This PR introduces error handling in the TPCInterface.recv method to handle any connection errors that occur during the socket.socket.recv call.

Motivation and Context

Resolves #996.

This only occurs if the network disconnection happens during recv, which was tricky to catch when testing this manually. We're now seeing this in practice and this will enable agents to handle the error and retry.

How Has This Been Tested?

This has not been tested and likely won't until it's deployed on site.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.