Transaction pooling: Setup w/o limits

[jesperpedersen]

Create functionality such that the transaction pipeline will work without limits.

This mainly means transferring socket descriptors to children, and allowing transaction pooling to create connections after startup

[VandanaKumari18]

Hi @jesperpedersen , I want to work on this issue, Please assign this to me.

[jesperpedersen]

@VandanaKumari18 Sounds good - feel free to ask questions about it to Luca or me here or in private (see AUTHORS)