Use correct directories for commands

[alpe]

wasmd add-genesis-account command was accessing the wrong folder for the key

Also added some tests from cosmos-sdk simapp

[codecov]

Codecov Report

Merging #307 (e21e9b1) into master (cbda602) will increase coverage by 0.35%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #307      +/-   ##
==========================================
+ Coverage   17.49%   17.85%   +0.35%     
==========================================
  Files          35       39       +4     
  Lines       10505    10890     +385     
==========================================
+ Hits         1838     1944     +106     
- Misses       8566     8833     +267     
- Partials      101      113      +12     

Impacted Files	Coverage Δ
cmd/wasmd/root.go	51.68% <100.00%> (ø)
cmd/wasmd/testnet.go	0.00% <0.00%> (ø)
cmd/wasmd/main.go	0.00% <0.00%> (ø)
cmd/wasmd/genaccounts.go	62.36% <0.00%> (ø)
x/wasm/internal/keeper/keeper.go	90.30% <0.00%> (+0.60%)	⬆️

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[alpe]

Closing this in favour of #308