Composite:  Remove all dependencies on CONFIG_SYSTEM_COMPOSITE_* configuration settings.  Nothing in the OS can depend on external application settings.

Composite:  Move board_msc* interfaces from apps/system/composite to the board specific OS logic where they belong.

Socket I/F: More fixes for USRSOCK.  The good link fooled me because a critical file was not included in the link.

Socket I/F: Fix bad copy-past error.  sendto() was called the address family's send() instead of sendto().

Socket interface:  Fix some configuration chaos.  Sometime CONFIG_NET_UDP/TCP was used when CONFIG_NET_LOCAL_DGRAM/STREAM was intended.

STM32 F7 Ethernet:  Fix typo in header; Add memory sync barrier between writing to DMA TX descriptor and restarting DMA TX. Avoid calling work_queue on pollwork if it's already queued, just skip a poll cycle instead.  Nucleo-144: Fix RMII TXD1 signal, connected to PB13 not to PG14.

Sockets:  Initial steps to adde a socket interface to the networking.  Each address family will have an interface that describes how to perform socket operations on that address family.  Currently only a couple of methods are defined in the table as a proof of concept.  More to come.  Currently there are only tables for the INET/INET6 family, the Unix LOCAL family, and the raw PACKET family.  Hopefully there will be AF_IEEE802154 and AF_BLUETOOTH comming down the pike.