Add configurable log for storage server

This patch add configurable log for swift account/container/object
server service.
Partially implements blueprint puppet-swift-log-support.

Change-Id: Ib3db483dfbad97f23ab7ba2068632856b5e00f11
Added the allow_versions flag to enable/disable object versioning in swift object container

Change-Id: Id78be1a8c3dccd550c92204c4aaa1cf32edcbf61
Merge "Added the allow_versions flag to enable/disable object versioning in swift object container"