[Enhancement]: create networks using random names

[mdelapenya]

Proposal

The networks API is fairly simple at the moment, but it's creating networks with a given name, which could not be the most valuable thing when running tests in parallel.

Ideally, the network name should be a random string, even thought it's an alias for Docker:

// Network name is strictly a user-friendly alias to the network
// which is uniquely identified using ID.
// And there is no guaranteed way to check for duplicates.