Add config knobs to enable/disable individual BGP capabilities per neighbor.

e.g. announce refresh no. With this be more aggressive when announcing our
capabilities and enable all of them by default. If there are troubles with
some neighbors adding the following config lines should bring you back
to the old behaviour:
announce refresh yes # was already on by default
announce restart no
announce as-4byte no # was only set on sessions to peers with 4byte AS nums
OK henning and sthen

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