kyua: Add "prepare" command

This introduces the requirement preparation handler concept, with the
first handler implemented to load the required kernel modules.

Running without arguments lists all

kyua: Add "prepare" command

This introduces the requirement preparation handler concept, with the
first handler implemented to load the required kernel modules.

Running without arguments lists all available handlers:

kyua prepare

Currently there are only two handlers:

all: runs all available handlers
kmods: loads the modules declared by required_kmods metadata

The dry run option lists the required modules without actual loading:

kyua prepare { --dry-run | -n } kmods

The "prepare" command traverses only the given tree of tests, i.e., the
following invocation lists all required modules for the whole test
suite:

kyua prepare -k /usr/tests/Kyuafile -n kmods

, while this one is limited to the pf tests only:

kyua prepare -k /usr/tests/sys/netpfil/pf/Kyuafile -n kmods

Reviewed by: ngie
Differential Revision: https://reviews.freebsd.org/D48087

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