DO NOT MERGE: Multihoming: hot swap gossip socket and add admin rpc interface

[gregcusack]

DO NOT MERGE

Problem

Need to be able to swap gossip sockets at runtime for multihoming support.
Still needs to be tested on node with two physical interfaces and 2 distinct IPs
needs to be made more generic

[codecov-commenter]

Codecov Report

❌ Patch coverage is 75.45126% with 68 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.8%. Comparing base (f96b707) to head (e888770).
⚠️ Report is 3264 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #6446    +/-   ##
========================================
  Coverage    82.8%    82.8%            
========================================
  Files         849      851     +2     
  Lines      378935   379143   +208     
========================================
+ Hits       313872   314079   +207     
- Misses      65063    65064     +1     

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[gregcusack]

closing in favor of: #6474