[FAB-12274] Increase CouchDB maxRetriesOnStartup

As there have been reports of peer exhausting retries before CouchDB
becomes available in docker networks, increase maxRetriesOnStartup
from 10 to 12.
Each retry will wait 2x as long as the prior before retrying.

Change-Id: If322e9fd0a89dad783cd11ed89dd11ade06c3b0f
Signed-off-by: David Enyeart <enyeart@us.ibm.com>

sampleconfig/core.yaml

@@ -625,7 +625,7 @@ ledger:
  # Number of retries for CouchDB errors
  maxRetries: 3
  # Number of retries for CouchDB errors during peer startup
- maxRetriesOnStartup: 10
+ maxRetriesOnStartup: 12
  # CouchDB request timeout (unit: duration, e.g. 20s)
  requestTimeout: 35s
  # Limit on the number of records per each CouchDB query