Create couchdb database automatically for main system ledger upon startup.
If couchdb database already exists do not re-create.
There will be one couchdb database for system ledger, and
eventually one couchdb database for each subledger.

Tests for auto-create are included, as well as some minor
refactoring and debug enhancements that were required as
part of the testing.

Change-Id: Ia90ffd4de74346e2472d31eceaf63f24ad1bf04e
Signed-off-by: denyeart <enyeart@us.ibm.com>