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Add session-affinity for services (#369)

client-ip affinity with a specified timeout ensures the same client
goes to the same backend using a hash on the nw_src field.
The above flow will be added at a higher prio than the regular 5 tuple
hash flow.
by using hard_timeout we ensure this flow is deleted by ovs once
timeout is reached at which affinity goes away and we start using
5 tuple hash from then on

affinity flow
 cookie=0x0, duration=14.224s, table=5, n_packets=0, n_bytes=0, hard_timeout=30, priority=51,ip,reg6=0xb,nw_dst=169.254.169.254 actions=set_field:00:22:bd:f8:19:ff->eth_src,set_field:e2:35:f9:9e:2c:3b->eth_dst,multipath(nw_src,1024,iter_hash,1,32,NXM_NX_REG7[]),goto_table:6

regular flow
 cookie=0x0, duration=14.224s, table=5, n_packets=0, n_bytes=0, priority=50,ip,reg6=0xb,nw_dst=169.254.169.254 actions=set_field:00:22:bd:f8:19:ff->eth_src,set_field:e2:35:f9:9e:2c:3b->eth_dst,multipath(symmetric_l3l4+udp,1024,iter_hash,1,32,NXM_NX_REG7[]),goto_table:6

Signed-off-by: Madhu Challa <challa@gmail.com>