[FAB-3414] Improve unit tests for couchdb
[FAB-3414] Improve unit tests for couchdb

Improve unit tests for /fabric/core/ledger/util/couchdb

Change-Id: I1b3c8d28b921abcebf2240bedd180392461c2290
Signed-off-by: Chris Elder <f9f6b1bd4bf36e92931200e996f041a94a02bd07@us.ibm.com>

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