add ipv4 address configuration for upper user (i.e., ns-3)
add unresolve symbols

Conflicts:
	sys/sim/globals.c
implement _sleep/wakeup (sbwait/wakeup)

Conflicts:
	sys/sim/glue.c
add symbols (sha1, etc) for mptcp 0.3
revert ipv4 address configuration to ioctl based request