Registry: Prevent registering loopback addresses

[mkykadir]

to reduce the attack surface on nodes' host machines. Loopback address registry is still allowed when node.testing is set (i.e. Registry and network is in testing mode) to still support local testing networks.

Fixes #3261

[codecov[bot]]

Codecov Report

Merging #3264 (10c3eab) into v0.x.x (4a16c27) will increase coverage by 0.06%. The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           v0.x.x    #3264      +/-   ##
==========================================
+ Coverage   87.80%   87.87%   +0.06%     
==========================================
  Files         164      164              
  Lines       16923    16929       +6     
==========================================
+ Hits        14860    14876      +16     
+ Misses       2063     2053      -10     

Flag	Coverage Δ
integration	36.16% <ø> (?)
unittests	87.82% <33.33%> (+0.01%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
source/agora/node/FullNode.d	73.37% <ø> (-0.31%)	:arrow_down:
source/agora/node/Registry.d	77.13% <33.33%> (-0.56%)	:arrow_down:
source/agora/network/Manager.d	79.01% <0.00%> (+0.65%)	:arrow_up:
source/agora/consensus/state/Ledger.d	91.27% <0.00%> (+0.67%)	:arrow_up:
source/agora/common/BanManager.d	87.39% <0.00%> (+0.84%)	:arrow_up:
source/agora/node/Validator.d	92.42% <0.00%> (+1.01%)	:arrow_up:
source/agora/utils/Log.d	62.26% <0.00%> (+5.03%)	:arrow_up:

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