http_timeout config option coupling

[clayg]

The reconstructor uses the http_timeout config option for both for getting REPLICATE responses [1] and also in SSYNC protocol state changes [2].

It would be better if they were independently tunable.

maybe

self.replicate_http_timeout = conf.get('replicate_http_timeout', conf.get('http_timeout'))
self.ssync_http_timeout = conf.get('ssync_http_timeout', conf.get('http_timeout'))

sorta preference backwards compat thing going on? The replicator probably has the same issue.

1. https://github.com/openstack/swift/blob/da9cd166099a1f29b63e681a68de6da84eed679c/swift/obj/reconstructor.py#L545
2. https://github.com/openstack/swift/blob/da9cd166099a1f29b63e681a68de6da84eed679c/swift/obj/ssync_sender.py#L366