fix(libs/utils): Use valid ip4 address

[renaynay]

Fixes an issue where localhost was not accepted as a valid --gateway.addr. Uses net.ResolveIPAddr instead.

Found by @tuxcanfly

[Wondertan]

We have tests for the func and should cover this case

[codecov-commenter]

Codecov Report

Merging #2394 (fda991e) into main (f32c903) will decrease coverage by 0.22%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #2394      +/-   ##
==========================================
- Coverage   50.74%   50.52%   -0.22%     
==========================================
  Files         157      157              
  Lines        9925     9925              
==========================================
- Hits         5036     5015      -21     
- Misses       4445     4464      +19     
- Partials      444      446       +2     

Impacted Files	Coverage Δ
libs/utils/address.go	53.84% <100.00%> (ø)

... and 3 files with indirect coverage changes

[walldiss]

Why do you think the address is invalid?

[renaynay]

@walldiss first addr returned for localhost is ipv6 shorthand loopback addr and it's not compatible with validation

[walldiss]

To filter out ipv6 you can use

net.ResolveIPAddr("ip4",addr)