Add notes on metadata preservation working only sometimes (#816)
Add notes on metadata preservation working only sometimes (#816)

* Add runtime_CLI docs on table_add and a few other commands

* Add some notes on metadata sometimes being preserved for operations ...
... such as recirculate, resubmit, and clone, but sometimes not being
preserved, and why, and a little bit about what you can do about it.

p4lang/behavioral-model,p4lang/behavioral-model,p4lang/behavioral-model,p4lang/behavioral-model,p4lang/behavioral-model