CLI Startup - Single start command for Single Node

add a feature to fire off a single node and simplify the columnstore single node setup process to as few steps as possible.

I want initial setup for single nodes to look something like this:

sudo dnf -y install MariaDB-columnstore-engine

mcs start

Removing these two steps that would use a default API key (in the CNF file) and only add node localhost:

mcs cluster set api-key --key <your_key> 

mcs cluster node add --node <hostname>