Postgres optimizations are not enabled correctly

[awrichar]

While troubleshooting #1196, I found that although I was using Postgres, the MultiRowInsert option was disabled. It's therefore likely some other Postgres optimizations are disabled by default as well.

Seems to be fallout from moving database configuration around between core and firefly-common (see #1110).

[matthew1001]

I've drafted PR #1197 to resolve this issue, but it will have to remain in draft until the pre-req PR hyperledger/firefly-common#49 has been approved and we have a new firefly-common release.

[matthew1001]

Closed by PR #1197