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cmd/flux: use optparse for flux(1) subcommands

Convert flux(1) to use optparse_t for main option processing and the
handling of internal or "builtin" subcommands.

All internal flux(1) subcommands are now registered as optparse
subcommands. In order to ease the addition of new builtins, builtin
subcommands are grouped separately in src/cmd/builtin/*.c and compiled
into flux.c.

Each builtin module now exports a single "registration" function
named `subcommand_<name>_register`, where <name> is replaced with
the basename of the C source file. The registration function is
responsible for registering one or more new subcommands with flux.c
optparse_t object which is passed to the function.

A new script `builtin-cmds-list.sh` automatically generates a table of
these functions in builtin-cmds.c for use during flux.c initialization.

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