db_command.c: use designated initializers

db_command.c: use designated initializers

Provide separate helper macros for regular commands and next-level table
commands as they are mutually exclusive. This ensures proper
initialization of each element and allows us to exclude some redundant
fields, such as specifying .more = NULL for every regular command.

Reviewed by:	markj, jhb
MFC after:	3 days
Sponsored by:	Juniper Networks, Inc.
Sponsored by:	Klara, Inc.
Differential Revision:	https://reviews.freebsd.org/D35580

(cherry picked from commit 8a0994823365740f4d92842c2d6f7f524310ba64)