Since introducing the XML <defaultValue> node it was common, but redundant, practice to also add a help string indicating which value would be used as default if the node is unset.

This makes no sense b/c it's duplicated code/value/characters and prone to error. The node.def scripts should be extended to automatically render the appropriate default value into the CLI help string.

For e.g. SSH the current PoC renders:

(20:08) cpo lnx01:~/vyos-1x [current] # cat templates-cfg/service/ssh/port/node.def
multi:
type: txt
help: Port for SSH service (default: 22)
val_help: u32:1-65535; Numeric IP port
syntax:expression: exec "${vyos_libexec_dir}/validate-value  --exec \"${vyos_validators_dir}/numeric --range 1-65535\"  --value \'$VAR(@)\'"; "Invalid value"

Not all subsystems are already migrated to get_config_dict() and make use of the defaults() call - those subsystems need to be migrated, first

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