Stub out `getBlocksSince` and `getBlock` methods#6853

Merged

CriesofCarrots merged 4 commits intosolana-labs:masterfrom CriesofCarrots:get-block-rpcs

Nov 11, 2019

+136-31

Commits on Nov 11, 2019

Add getBlocksSince rpc method, and initial stub of getBlock method
Tyera Eulberg
committed
Return test transactions from getBlock method
Tyera Eulberg
committed
clippy
Tyera Eulberg
committed
Add comment on get_block method
Tyera Eulberg
committed