Apply netgraph7 megapatch.

* Translate objcache calls.
* Translate uma_zone to objcache.
* Introduce libnetgraph7 (is compiled when WANT_NETGRAPH7 is defined).
* Welcome ng_socket.
* Convert netgrap

Apply netgraph7 megapatch.

* Translate objcache calls.
* Translate uma_zone to objcache.
* Introduce libnetgraph7 (is compiled when WANT_NETGRAPH7 is defined).
* Welcome ng_socket.
* Convert netgraph netisr to a real taskqueue. This fixes a deadlock
specific to dragonfly.
* Welcome ng_async.
* Welcome ng_UI.
* Welcome ng_ether.
* Fix mtx_assert translation.
* Welcome ng_hole.
* Welcome ng_cisco.
* Welcome ng_iface.
* Welcome ng_tee.
* Welcome ng_atmllc.
* Welcome ng_bpf.
* Welcome ng_vjc.

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