fix config and add additional binding for getting options for different networks

[Guillembonet]

now mobile team can work with testnet for testing

Signed-off-by: Guillem Bonet guillem@mysterium.network

[codecov-commenter]

Codecov Report

Merging #5532 (b5e4721) into master (2602374) will decrease coverage by 0.06%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #5532      +/-   ##
==========================================
- Coverage   37.91%   37.84%   -0.07%     
==========================================
  Files         359      359              
  Lines       20065    20085      +20     
==========================================
- Hits         7608     7602       -6     
- Misses      11702    11730      +28     
+ Partials      755      753       -2     

Impacted Files	Coverage Δ
config/config.go	44.25% <0.00%> (-0.38%)	⬇️
mobile/mysterium/entrypoint.go	0.00% <0.00%> (ø)
requests/dialer_swarm.go	72.18% <0.00%> (-3.76%)	⬇️
p2p/channel.go	66.78% <0.00%> (-1.45%)	⬇️
nat/traversal/pinger.go	75.96% <0.00%> (-0.39%)	⬇️
core/policy/oracle.go	91.89% <0.00%> (+5.40%)	⬆️

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