This change moves our e2e tests into a separate package to make room for proper unit and integration tests.
This is Phase 1 described in #371.
Changes:
Makefile has separate directives to run unit/integration tests and e2e tests,
CI runs unit/integration tests first and then e2e tests,
E2e tests are in reliability order, i.e. the least reliable tests are run in the end to be sure that nothing else is broken,
Some tests are fixed or quarantined.
Refactor and clean up Jail package:
Removes account.Manager and txqueue.Manager from Jail as they are not used anymore
Removes messageID related code from Jail.Send
Simplifies Jail.Send to be a wrapper around RPC client's CallRaw
Renames jail_cell* to cell*
Related cleanups