Job packets can have more that 1 midstate. If the stratum supports
version-rolling, calculate additional midstates by incrementing
the version with the version_mask provided by the stratum server.
Currently does 4 midstates for each extranonce2.
Create an idf component for the bm1387 module and add a basic
test to verify that a bm1397 can produce a good nonce. bm1397
is also added to the list of tests under the unit test runner
component.