Allow deprecated usage in the code produced by an error-chain macro
Allow deprecated usage in the code produced by an error-chain macro

error-chain is in maintenance mode and may not fix the deprecated usage.
In any case, we would like to move away from error-chain.

Signed-off-by: mulhern <7b51bcf507bcd7afb72bf8663752c0ddbeb517f6@redhat.com>

stratis-storage/stratisd,trgill/stratisd,stratis-storage/stratisd,trgill/stratisd,stratis-storage/stratisd