Setup command of uplink has to create the configuration directory just
before saving the configuration file for making it more robust than
creating in the initial state of the process.
When creating the directory at the beginning of the process leaves the
possibility to delete such directory during the setup process and leads
to a failure.
Ticket https://storjlabs.atlassian.net/browse/V3-3545
Change-Id: I30db0175e23a597e9675d267b4d7e25d5d4c5119
80a6219c4b