Use imsgbuf_queuelen() instead of accessing the w.queue member.

OK tb@

Rename imsg_init, imsg_clear, imsg_read, imsg_write and imsg_flush to
imsgbuf_init, imsgbuf_clear, imsgbuf_read, imsgbuf_write and imsgbuf_flush.

This separates the imsgbuf API from the per-imsg API

Rename imsg_init, imsg_clear, imsg_read, imsg_write and imsg_flush to
imsgbuf_init, imsgbuf_clear, imsgbuf_read, imsgbuf_write and imsgbuf_flush.

This separates the imsgbuf API from the per-imsg API.

OK tb@

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Add radiusd(8) and radiusctl(8). They are WIP. radiusd(8) is a RADIUS
server and radiusctl(8) is to control the server. radiusd(8) currently
supports bsdauth and radius (upstream radius servers) a

Add radiusd(8) and radiusctl(8). They are WIP. radiusd(8) is a RADIUS
server and radiusctl(8) is to control the server. radiusd(8) currently
supports bsdauth and radius (upstream radius servers) as authentication
backends.

fixes from jsg blambert
ok deraadt

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