Adjust the DNS Bootstrap Id for Alphanet

[egieseke]

Summary

If network is alphanet, then set DNS BootStrapId to "alphanet.algodev.network".

Test Plan

Built and tested locally. Verified that node was increasing rounds.

[codecov]

Codecov Report

Merging #4231 (3a0067a) into feature/alphanet (15cdcea) will decrease coverage by 0.02%.
The diff coverage is 0.00%.

@@                 Coverage Diff                  @@
##           feature/alphanet    #4231      +/-   ##
====================================================
- Coverage             54.63%   54.60%   -0.03%     
====================================================
  Files                   391      391              
  Lines                 48790    48792       +2     
====================================================
- Hits                  26654    26643      -11     
- Misses                19910    19920      +10     
- Partials               2226     2229       +3     

Impacted Files	Coverage Δ
config/config.go	47.05% <ø> (ø)
config/localTemplate.go	40.00% <0.00%> (-2.86%)	⬇️
network/wsPeer.go	68.21% <0.00%> (-2.20%)	⬇️
crypto/merkletrie/trie.go	66.42% <0.00%> (-2.19%)	⬇️
agreement/cryptoVerifier.go	67.60% <0.00%> (-2.12%)	⬇️
agreement/proposalManager.go	96.07% <0.00%> (-1.97%)	⬇️
crypto/merkletrie/node.go	91.62% <0.00%> (-1.87%)	⬇️
data/transactions/verify/txn.go	44.88% <0.00%> (+0.88%)	⬆️
data/abi/abi_type.go	88.62% <0.00%> (+0.94%)	⬆️
catchup/service.go	70.12% <0.00%> (+1.23%)	⬆️

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