`netgroupgetusers'.
(load_netapi): Load function pointers `netlocalgroupgetmembers'
and `netgroupgetusers'.
(enum_local_users): New function.
(enum_local_groups): Call `enum_local_users' for each group if
`print_users' is set.
(enum_users): New function.
(enum_groups): Call `enum_users' for each group if `print_users' is set.
(usage): Add usage text for `-u/--users'.
(longopts): Add option `--users'.
(opts): Add option character `u'.
(main): Set `print_users' according to option `-u/--users'.
Call `enum_local_groups' and `enum_groups' with additional parameter
`print_users'.
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