py: Implement JSON validation in nftables module

Using jsonschema it is possible to validate any JSON input to make sure
it formally conforms with libnftables JSON API requirements.

Implement a simple validator class for use within a new Nftables class
method 'json_validate' and ship a minimal schema definition along with
the package.

Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

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