[R4R] Require moniker on gaiad init

[alexanderbez]

closes: #2757

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[alessio]

I'd rather make the flag required. It is a mandatory user input.

[alexanderbez]

@alessio I was leaning this way too. Ok 👌

[codecov]

Codecov Report

Merging #2773 into develop will increase coverage by 0.02%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           develop    #2773      +/-   ##
===========================================
+ Coverage    56.63%   56.65%   +0.02%     
===========================================
  Files          156      156              
  Lines         9783     9783              
===========================================
+ Hits          5541     5543       +2     
+ Misses        3864     3863       -1     
+ Partials       378      377       -1

[jackzampolin]

So I was able to run tests successfully here (make test and make test_sim_gaia_multi_seed), but when running gaiad init with the built binary it doesn't require the flag and the command runs w/o requiring the flag.

[alexanderbez]

@jackzampolin fixed!

[jackzampolin]

tACK

[cwgoes]

TestedACK