Fix #243, #247, specification of remote IP address in bpcat

[jphickey]

Describe the contribution This fixes two issues that were observed during interoperability testing:

• the remote UDP/IP address needs to be configurable at runtime
• need to use sendto rather than connect + send because the returning traffic may not be from the same port number.

Fixes #243 Fixes #247

Testing performed Interoperability testing

Expected behavior changes UDP traffic flows between nodes as expected

System(s) tested on RHEL 8 test systems

Contributor Info - All information REQUIRED for consideration of pull request Joseph Hickey, Vantage Systems, Inc.

[jphickey]

Reviewed and approved at 2023-09-27 CCB