Initial import of ucarp-1.0 from pkgsrc-wip.

UCARP allows a pair of hosts to share common virtual IP addresses in order to
provide automatic failover. It is a portable userland implementation of the
secure and patent-free Common Address Redundancy Protocol (CARP, OpenBSD's
alternative to the VRRP).

Strong points of the CARP protocol are : very low overhead, cryptographically
signed messages, interoperability between different operating systems and no
need for any dedicated extra network link between redundant hosts.

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