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Closes #479: Validate BGP community value (#883)

Validating BGP community values consist of making sure that they follow
a pattern that can properly represent communities according to RFC1997,
RFC4360 and RFC8092. Therefore, BGP communities can be represented like:

- `<16-bit int>:<16-bit int>` for RFC1997
- `(origin|target):<32-bit int>:<16-bit int>` or
`(origin|target):<16-bit int>:<32-bit int>` for RFC8092
- `<32-bit int>:<32-bit int>:<32-bit int>` for RFC8092

As this behaviour can break the way a user expresses communities, the
validation can be turned off by setting `VALIDATE_BGP_COMMUNITY_VALUE =
False` in the configuration.

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