src: improve rule error reporting

src: improve rule error reporting

Kernel provides information regarding expression since
83d9dcba06c5 ("netfilter: nf_tables: extended netlink error reporting for
expressions").

A common mistake is to refer a chain which does not exist, e.g.

 # nft add rule x y jump test
 Error: Could not process rule: No such file or directory
 add rule x y jump test
                   ^^^^

Use the existing netlink extended error reporting infrastructure to
provide better error reporting as in the example above.

Requires Linux kernel patch 83d9dcba06c5 ("netfilter: nf_tables:
extended netlink error reporting for expressions").

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>