In this commit we add a set of benchmarks to be able to measure the
enciphering and deciphering speed of the current scheme with the
current scrypt parameters.
On my laptop I get about 100ms per attempt:
⛰ go test -run=XXX -bench=.
goos: darwin
goarch: amd64
pkg: github.com/lightningnetwork/lnd/aezeed
BenchmarkToMnenonic-4 10 102287840 ns/op
BenchmarkFromMnenonic-4 10 105874973 ns/op
PASS
ok github.com/lightningnetwork/lnd/aezeed 3.036s
