Unified format of boolean params in conf files

In swift conf files, boolean options use different
format: some use true/false, and some use True/False.
This patch is aim to using lowcase true/false to unify
boolean params formats in swift conf files.

Fix Bug #1203421

Change-Id: I3e1bfc6e43231f51e0710aa54869f3774ee896b1
Merge "Unified format of boolean params in conf files"