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This also ensures that misconfigured routers (one side
ptp and one side broadcast) do not make adjacency.

ea_same() sometimes returns true for different route attributes,
which caused that hash table in BGP does not work correctly and
some routes were sent with different attributes.

Independent sessions on netlink sockets mixed state
in some common variables.

Allows to add more interface patterns to one common 'options'
section like:

interface "eth3", "eth4" { options common to eth3 and eth4 };

Also removes undocumented and unnecessary ability to specify
more interface patterns with different 'options' sections:

interface "eth3" { options ... }, "eth4" { options ... };

FreeBSD coded added. BSD cannot set BGP passwords itself.
This has to be done by external command.

When sending 'third party' BGP update, Bird used bogus link local
addresses instead of addresses it received before.

options.

Also removes code skipping SNPAs
(obsoleted by newer RFCs, should be ignored).