UCS/SYS: Add default gateway support to reachability check - 1.20

[gleon99]

Port #11000

What?

Added default gateway support to the routing table reachability check
https://redmine.mellanox.com/issues/4659780

Summary by CodeRabbit

• New Features

  • Detect IPoIB (InfiniBand) network interfaces.
  • Option to control whether default-gateway routes are considered during route checks.

• Improvements

  • Device addresses now indicate allowance of default-gateway routing for non-IPoIB paths.
  • Reachability checks respect link-layer specifics and honor the new default-gateway option.

• Bug Fixes

  • Corrected route parsing and destination initialization to avoid incorrect handling and errors.

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