CBQE-0: allow pass char "'" in conf files

Change-Id: Ic48718d646964822f748fa2bfbaa9ed651346206
Reviewed-on: http://review.couchbase.org/27291
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>