sharding: Let swift-manage-shard-ranges accept a relative path
sharding: Let swift-manage-shard-ranges accept a relative path

Previously, passing a relative path would confuse the ContainerBroker about
which DB files are available, leading to an IndexError when none were found.

Just call realpath() on whatever the user provided so we don't have to muck
with any of the broker code.

Change-Id: Icdf100dfcd006d975b49d151b99aa9272452d013

tipabu/swift,openstack/swift,swiftstack/swift,tipabu/swift,tipabu/swift,openstack/swift,tipabu/swift,swiftstack/swift,swiftstack/swift,openstack/swift,openstack/swift