Add configuration option allow-fallback-on-unknown-dc

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[codecov-commenter]

Codecov Report

Merging #216 (cd29f3e) into master (706aef8) will decrease coverage by 0.88%.
The diff coverage is 92.85%.

@@            Coverage Diff             @@
##           master     #216      +/-   ##
==========================================
- Coverage   84.18%   83.29%   -0.89%     
==========================================
  Files          67       68       +1     
  Lines        1859     1874      +15     
==========================================
- Hits         1565     1561       -4     
- Misses        206      224      +18     
- Partials       88       89       +1     

Impacted Files	Coverage Δ
internal/config/config.go	36.36% <ø> (ø)
internal/config/parse.go	84.61% <ø> (ø)
mtglib/proxy_opts.go	86.66% <ø> (ø)
mtglib/proxy.go	67.28% <92.85%> (+0.20%)	⬆️
logger/zerolog.go	82.00% <0.00%> (-18.00%)	⬇️
logger/noop.go	91.66% <0.00%> (-8.34%)	⬇️
network/circuit_breaker.go	76.92% <0.00%> (-7.70%)	⬇️
network/sockopts.go	18.18% <0.00%> (-6.82%)	⬇️
network/sockopts_unix.go	50.00% <0.00%> (ø)

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