Add Network Deploy option to set the root image to the Node Software deterministic image

[jeromy-cannon]

add and test the capability to set the Node Software deterministic Docker container image as the root image for the Network Node

Depends on:

• Charts[Network]: update configMaps for network node config files to use filename instead of removing the dot full-stack-testing#844
• Use k8s secrets to store keys and mount them #135
• Use k8s configMaps to mount files during solo network deploy #136