skip servers with too many errors

Keep track of errors from servers so that bad ones can be skipped once
a threshold is reached.  Key the error tracking off the hostname because
hosts may serve multiple repos under different url's and errors are
likely to be host-wide.

Implements: FS#29293.

Signed-off-by: Andrew Gregory <andrew.gregory.8@gmail.com>
Signed-off-by: Allan McRae <allan@archlinux.org>

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