edgex-vault logs contain errors about revoking consul token leases

[bnevis-i]

From edgexfoundry/edgex-compose#113:

While not fatal, this problem reflects a nuance about service ordering and the way we initialize the secret store.

Secret store is the first to run and initialize, followed by Consul. However, part of the initialization of the secretstore is to revoke tokens from the previous boot of the framework -- this causes Consul tokens to be revoked. It is possible that Consul may not be fully started by the time revokation is attempted, leading to these errors.