Config table passed to vshard.router.cfg() is destroyed

[Gerold103]

Author: @racktear
I tried to launch both router and storage on the same node this way:

local vshard_cfg = {
    sharding = {
        { -- replicaset #1
            { uri = 'localhost:3301', name = 'storage_1_a', master = true },
        }
    }
}
vshard.router.cfg(vshard_cfg)
vshard.storage.cfg(vshard_cfg, 'storage_1_a')

But it fails, because the call to vshard.router.cfg destroys the configuration table passed to it.

As a result, I get this:

./vshard/util.lua:41: Sharding config must be array of replicasets