runat: Add a runat(1) utility similar to the Solaris one

Solaris has a utility called runat(1) that runs a shell
command on a named attribute directory. This utility
is modelled after that one.

Re

runat: Add a runat(1) utility similar to the Solaris one

Solaris has a utility called runat(1) that runs a shell
command on a named attribute directory. This utility
is modelled after that one.

Reviewed by: kib (earlier version)
Differential Revision: https://reviews.freebsd.org/D49850

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