Super speed multisg unit test

[shargon]

This is the best improve, from 6' to less than one second, for this kind of test, we don't need to test scrypt encryption so is better to test with the lowest values

My concern is that currently, travis spend a lot of time in unit testing

[vncoelho]

Shargon, you are reverting the parallel creation of the wallets, right?
You found that a simple scrypt can be much faster, yes?

But why not process both in parallel?

[shargon]

because now is automatic

[codecov-io]

Codecov Report

Merging #915 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #915   +/-   ##
=======================================
  Coverage   45.16%   45.16%           
=======================================
  Files         178      178           
  Lines       12609    12609           
=======================================
  Hits         5695     5695           
  Misses       6914     6914

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[lock9]

Good trick