Remove field placeholders (fixes #748)

All of them are either required, or empty by default, or for example
node name is later populated on first connection.
Correctly handle ro dirs in ro dirs etc
Genfiles should be random by default
Short benchmark test only by default
Don't get stuck in idle while syncing from a disconnecting node
Merge pull request #753 from AudriusButkevicius/ph

Remove field placeholders (fixes #748)
Don't require godep to build