master: Shuffle @hosts to avoid same poll order

This increase the change of having a slow host always "hiding" fast ones, but only polled after
master: shuffle @plugins to avoid same poll order

Same as e866853e42d87e66840a22f9dcba3d07d1e588ad, but for plugins
Merge pull request #142 from steveschnepp/update-shuffle

Shuffle hosts & Plugins to avoid same issues