vhost_user: cleanup mem_table when

Signed-off-by: Nikolay Nikolaev <n.nikolaev@virtualopensystems.com>
vhost_user: implement stop()

Signed-off-by: Nikolay Nikolaev <n.nikolaev@virtualopensystems.com>
Merge pull request #291 from virtualopensystems/vhost_user_stop

Vhost user stop
generates more than one ingress rule per port
do egress filters
install egress filter
remove 'TODO' comment line
better merge of max's work, reenable security group config
first draft of stateful filters
implement CLOCK_MONOTONIC_COARSE for fast time-checking
use simple old/new/swap expiration algorithm
named conntrack module
external tracking code runs, yet to see what it's tracking
cleaner & thinner conntrack api
missing commas
conntrack: display a dump of all connections tracked
setting the other half of conntrack for test
use inet_ntop() instead of ugly string:format()
document conntrack API