libifconfig: Overhaul ifconfig_media_* interfaces

Define an ifmedia_t type to use for ifmedia words.

Add ifconfig_media_lookup_* functions to lookup ifmedia words by name.

Get media options as an

libifconfig: Overhaul ifconfig_media_* interfaces

Define an ifmedia_t type to use for ifmedia words.

Add ifconfig_media_lookup_* functions to lookup ifmedia words by name.

Get media options as an array of option names rather than formatting it
as a comma-delimited list into a buffer.

Sprinkle const on static the static description tables for peace of
mind.

Don't need to zero memory allocated by calloc.

Reviewed by: kp
Differential Revision: https://reviews.freebsd.org/D29029

(cherry picked from commit c4ba4aa547184ab401204096cdad9def4ab37964)

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libifconfig: Add a function to get down reason

For use in ifconfig.

Reviewed by: kp
Differential Revision: https://reviews.freebsd.org/D28991

(cherry picked from commit b12a960e4274926171dc7a4f988

libifconfig: Add a function to get down reason

For use in ifconfig.

Reviewed by: kp
Differential Revision: https://reviews.freebsd.org/D28991

(cherry picked from commit b12a960e4274926171dc7a4f9887a0d0a5195b44)

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libifconfig: Fix typo in symbol map

(cherry picked from commit 80545a16df95263781b3422695527b6238f4bd2c)

libifconfig: Set error in ifconfig_get_groups

This should return -1 with OTHER/ENOMEM set in the handle when malloc
fails, like everywhere else in libifconfig.

Reviewed by: kp
Differential Revision

libifconfig: Set error in ifconfig_get_groups

This should return -1 with OTHER/ENOMEM set in the handle when malloc
fails, like everywhere else in libifconfig.

Reviewed by: kp
Differential Revision: https://reviews.freebsd.org/D28964

(cherry picked from commit 1d9ba697f99a88b321a7d8b96fa142ea774cd3be)

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