[core.config] Make `parse_app_arg' a NOOP for tables.
[META] Use `core.config.parse_app_arg' uniformly.
[META] Refrain from using `([[{...}]]):format(...)' constructs
and use table literals instead.
Removed `designs/nfv/nfv' in favor of `designs/neutron/snabbnfv-bench'.