Fixes from testing

[hannahhoward]

various cleanups discovered while attempting to run singularity in devnet with motion

-- setting singularity into a TestNet mode
-- a couple more informative errors
-- allow some parsed byte values to be empty when creating a Schedule (so they just become 0)

[codecov]

Codecov Report

Patch coverage: 84.90% and project coverage change: -0.01% ⚠️

Comparison is base (ecfaca2) 64.93% compared to head (953e785) 64.92%.

❗ Current head 953e785 differs from pull request most recent head b6c53e2. Consider uploading reports for the commit b6c53e2 to get more accurate results

Additional details and impacted files

@@                Coverage Diff                 @@
##           release/v0.3.x     #255      +/-   ##
==================================================
- Coverage           64.93%   64.92%   -0.01%     
==================================================
  Files                 137      137              
  Lines                8099     8115      +16     
==================================================
+ Hits                 5259     5269      +10     
- Misses               2124     2128       +4     
- Partials              716      718       +2     

Files Changed	Coverage Δ
docs/swagger/docs.go	100.00% <ø> (ø)
handler/wallet/import.go	58.62% <0.00%> (ø)
model/replication.go	40.00% <ø> (ø)
service/dealpusher/dealpusher.go	74.35% <25.00%> (-0.65%)	⬇️
cmd/app.go	50.00% <50.00%> (ø)
handler/deal/schedule/create.go	85.58% <100.00%> (+0.97%)	⬆️

... and 1 file with indirect coverage changes

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