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Change the way efibootmgr works by specifying bootnum via -b parameter

Description

Change the way efibootmgr works by specifying bootnum via -b parameter

Instead of passing the bootnum to each different parameter, require users
to specify -b when running operations that need a bootnum.

This allows activation of a new boot entry at the same time it's created
by adding -a onto the command line.

Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D18648