There is no need to depend on the old context package now that the
minimum Go version is 1.7. The move to "context" eliminates our weird
vendoring setup. Some vendored code still uses golang.org/x/net/context
and it is now vendored in the normal way.
This change triggered new vet checks around context.WithTimeout which
didn't fire with golang.org/x/net/context.
* Include tests which now has consistent HEX encodings
* Comment out two failing tests: "
"TransactionWithHihghNonce" due to wrong nonce size
"TransactionWithSvalueHigh" due to wrong ECDSA s range
* Cleanup conversion functions and fix expected encodings for
tests validation fields
* Add initial go wrapping for TransactionTests with some tests
disabled in lieu of consistent HEX encodings and a few other
pending bugfixes
* TODO: Consider better way of perhaps modelling each test in
the JSON files as a single Go test, instead of one Go test per
JSON file