deep symbolize database server config

so that child shackles envs are properly merged into the main
config

Change-Id: Idab736f8bc3b8eb269ee4861745943c77be7aef6
Reviewed-on: https://gerrit.instructure.com/36353
Reviewed-by: Jacob Fugal <jacob@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
Product-Review: Cody Cutrer <cody@instructure.com>
QA-Review: Cody Cutrer <cody@instructure.com>
bump version

Change-Id: I0a809b48b60412f56d767292edf170ef25aa1d48