Move ErrorList to util
Merge pull request #1593 from thockin/utilerrlist

Move ErrorList to util
Try to fix flakiness by increasing timeouts, because that is always the best way to perform such a fix.
Merge pull request #1606 from lavalamp/fix

Try to fix flakiness by increasing timeouts
Add a util/exec interface for testing execs.
Add a pkg for iptables support

This makes iptables an injectable dependency.  The test for this started off
simple, but got a bit out of hand.  It's starting to become a mocking
framework.