Add the default configuration files for CouchDB 2.3.

Author: style95

ansible/roles/couchdb/files/default.d/10-docker-default.ini

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+; CouchDB Configuration Settings
+
+; Custom settings should be made in this file. They will override settings
+; in default.ini, but unlike changes made to default.ini, this file won't be
+; overwritten on server upgrade.
+
+[chttpd]
+bind_address = any
+
+[httpd]
+bind_address = any

ansible/roles/couchdb/files/default.d/README

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+CouchDB default configuration files
+
+Files found under the etc/default.d directory that end with .ini are
+parsed within couchdb(1) at startup.
+
+This directory is intended for distribution-specific overrides of
+CouchDB defaults. Package maintainers should be placing overrides in
+this directory.
+
+System administrator should place overrides in the etc/local.d directory
+instead.