Add examples to veriexec(8)

Add missing flags to veriexec(8) as well as some examples to
help explain usage.

Also add veriexec.4

Sponsored by: Juniper Networks, Inc.

Reviewed by: imp
Differential

Add examples to veriexec(8)

Add missing flags to veriexec(8) as well as some examples to
help explain usage.

Also add veriexec.4

Sponsored by: Juniper Networks, Inc.

Reviewed by: imp
Differential Revision: https://reviews.freebsd.org/D46207

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