birdc configure exits with 0 on error

[Vincent Bernat]

Hey!

"birdc configure" (or any command in fact) exits with 0 on error. This
is a bit annoying as when using "systemctl reload bird", we get no
notification there is an error.

Looking at the source code, it seems there is no easy way to hack around
that. Commands do not report an error code and messages printed are not
tagged as errors.

Here is a small workaround for systemd:

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