Fix Bailiwicked module exceptions and SRCPORT default

[Shubham0699]

Fixes #20172

Both bailiwicked modules were throwing 'undefined method each for IPAddr' exceptions due to DNS library changes. Fixed by:

1. Wrapping IPAddr object in array when passing to nameservers parameter

   • Changed nameservers: rr1.address to nameservers: [rr1.address.to_s]
   • Applies to both bailiwicked_domain.rb and bailiwicked_host.rb

2. Changed SRCPORT default from nil to 0 for automatic port selection

   • Prevents validation errors when running modules
   • 0 is the documented value for automatic port selection

Verification

• Fixes the NoMethodError exception reported in Bailiwicked module exceptions #20172
• SRCPORT now uses a valid default value (0) for automatic port selection
• Code follows the pattern used in other DNS resolver initializations in the codebase