Add normalize_address normalize_prefix Jinja filters

[matejv]

It would be useful to be able to have all parsed IP addresses in the same textual format.

Especially important to be able to use diff functions with IPv6 since some platforms may not follow recommendations in Section 4 of RFC 5952 (looking at you Cisco).

[dbarrosop]

Could you add unit tests for the jinja_filters? Something simple, like this:

https://github.com/napalm-automation/napalm-base/blob/develop/test/unit/TestHelpers.py#L268

Feel free to create the file test/unit/test_jinja_filters.py and put it there.

[matejv]

Something like this?

BTW: cidr_to_netmask filter returns the netmask as a netaddr.IPAddress object. Is this intentional or shall we convert to string before returning?

[matejv]

Added filter prefix_to_addrmask that will be used in translator for IOS

[dbarrosop]

BTW: cidr_to_netmask filter returns the netmask as a netaddr.IPAddress object. Is this intentional or shall we convert to string before returning?

Yeah, we should convert to string for consistency with your additions. Would you mind fixing in this PR now that you are at it? :P

Thanks for adding tests to the already existing filters!

[matejv]

No problem, done! :)