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2020-04-12T16:13:05.940633Z
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carp tests: Basic functionality test

Set up three vnet jails, bridged together. Run carp between two of them.
Attempt to provoke locking / epoch issues.

Reviewed by:	mav (previous version), melifaro, asomers
Differential Revision:	https://reviews.freebsd.org/D24303

END