Allow configuring the listener-operator preset

[nightkr]

listener-operator needs to be configured with the correct preset to function correctly in cloud environments. Currently we don't support doing this with stackablectl, so you have to drop down to Helm instead.

We should add a new flag for this (I'd propose --listener-preset). This should be accounted for in:

• stackablectl operator install
• stackablectl release install
• stackablectl stack install
• stackablectl demo install

[NickLarsenNZ]

Before doing this, please consider the more general issue of overriding Helm values: #406

But also, it couldn't hurt to have a CLI override for this particular case.