Merge branch 'net-l2'

bootfs.manifest

bsd/machine/_align.h

bsd/machine/_limits.h

bsd/machine/atomic.h

bsd/machine/in_cksum.c

bsd/machine/in_cksum.h

bsd/machine/param.h

bsd/net.cc

bsd/net.hh

bsd/porting/_callout.h

bsd/porting/callout.cc

bsd/porting/callout.h

bsd/porting/netport.c

bsd/porting/netport.h

bsd/porting/netport1.cc

bsd/porting/rwlock.c

bsd/porting/rwlock.h

bsd/porting/sync_stub.c

bsd/porting/sync_stub.h

bsd/porting/uma_stub.c