John Baldwin 8794846a91 bhyve: Add support for handling disk resize events to block_if.
Allow clients of blockif to register a resize callback handler.  When
a callback is registered, register an EVFILT_VNODE kevent watching the
backing store for a change in the file's attributes.  If the size has
changed when the kevent fires, invoke the clients' callback.

Currently resize detection is limited to backing stores that support
EVFILT_VNODE kevents such as regular files.

Reviewed by:	grehan, markj
MFC after:	1 month
Differential Revision:	https://reviews.freebsd.org/D30504
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FreeBSD Source:

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Description
freebsd with flexible iflib nic queues
Readme 2.6 GiB
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Other 3.7%