* Improve json encoding/decoding and txn summary format

- TxnType and ResyncType are now marshalled as strings (unmarshalling works for both)
- Added tests for json encoding/decoding of TxnType and ResyncType

Signed-off-by: Ondrej Fabry <ofabry@cisco.com>

* Fix comments

Signed-off-by: Ondrej Fabry <ofabry@cisco.com>

* Ensure proto is encoded to json properly

Signed-off-by: Ondrej Fabry <ofabry@cisco.com>

* Improve recorded transaction formatting for json

Signed-off-by: Ondrej Fabry <ofabry@cisco.com>

* Log content length for HTTP client

Signed-off-by: Ondrej Fabry <ofabry@cisco.com>

* Add config subcommand with resync

Signed-off-by: Ondrej Fabry <ofabry@cisco.com>