When ovs restarts and needs to regenerate flows, some flows will be
missing in br-int, as follows:
* table=60,priority=4,in_port="int-br-floating" actions=resubmit(,61)
* table=60,priority=4,in_port="patch-tun" actions=resubmit(,61)
* table=61,priority=0 actions=resubmit(,62)
Call install_ingress_direct_goto_flows() again in the
_handle_ovs_restart() to ensure generate these flows.
Change-Id: I240a78879db757592df138a53b2c22d7f5a9ae13
Closes-Bug: #1920700
2bb52d49be