This commit adds a `defer` statement at the top of `TestRpcServer`
which will attempt a `recover` which tears down all active harnesses in
the event that one of the tests causes a panic in the main goroutine.
Before this commit, if a buggy test caused a panic while all integration
tests were being executed, then any active harnesses would fail to be
properly torn down. This would cause the running btcd processes to be
leaked, possibly interfering with future test runs until the process was
manually killed. This commit fixes such behavior.
In order to aide in debugging, when a test panics, the test number is
printed out along with a full stack-trace from the start of the test to
the panic point.
This commit introduces a new file: rpcserver_test.go dedicated for
including integration tests for btcd using the new rpctest package.
The tests are created using a TestMain instance first creates a single
main harness which is intended to be re-used across tests instances.
Afterwards all registered RPC tests are executed, with proper clean up
being executed regardless of the passing state of the tests.
The following RPC calls are excessed by the initial set of tests added:
* getbestblock
* getblockcount
* getblockhash
