Connector lifecycle API

[nklincoln]

With the continued evolution of Caliper, it is looking like the current connector lifecycle is not quite right.

We should look into updating the lifecycle, taking into account that we have both master and worker processes using the same connector. We are also a little bit "wasteful" in building and throwing things away between test rounds, which is a consequence of wanting to remain in-line with the current API.

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.