handle an array of slaves for the default shard

fixes CNVS-14883

Change-Id: I9985dd0d4574b3698c0536b2d92ea863065d1eb9
Reviewed-on: https://gerrit.instructure.com/39528
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Jacob Fugal <jacob@instructure.com>
Product-Review: Cody Cutrer <cody@instructure.com>
QA-Review: Cody Cutrer <cody@instructure.com>
bump version

Change-Id: I36e066c10549c21e42717e3822f0eabe73827df2