Move argument parsing to sub-command functions

Instead of doing most of the argument parsing in parse_cmdline(),
find the sub-command and (if required) the device name in main()
and do the rest in the sub-command handler function.  Pass argc
and argp around in struct cmd_context.

This also tightens up argument parsing slightly: extraneous or missing
arguments will now result in an error in a few cases where they were
previously ignored.  All test cases now pass.

Replace sub-command dispatch in doit() with a function pointer
in struct option.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>

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