Support multiple netmasks for trusted_upstream_proxies

[Ask Bjørn Hansen]

Hi everyone,

We needed to be able to specify several "trusted_upstream_proxies" netmasks, so I added support for that in https://github.com/abh/Perlbal/commit/72c0e466e644a6e3977d8e9d25238e5a929a4eb7

I made a pull request to the Perlbal repository, but figured it'd be polite to post it here, too.

- ask

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