CSIT-524: Traffic generator using python profiles

Profile name structure:
   [trex|ixia]-[sl|sf]-[topo]-[packet structure]-[scale]

   - Traffic generator - T-rex (trex) or Ixia (ixia)
   - Stateless (sl) or statefull (sf)
   - Topology - 2-node topology (2n) or 3-node topology (3n)
   - Packet structure - eth | ip4/6 | udp
   - Scale - e.g. ip4dst1, ip6dst10000, 4000u15p

Traffic types changed to stream profiles:

 - From: 2-node-bridge
   To:   trex-sl-2n-ethip4-ip4src253

 - From: 3-node-bridge
   To:   trex-sl-3n-ethip4-ip4src254

 - From: 3-node-IPv4-dst-1000000
   To:   trex-sl-3n-ethip4-ip4dst1000000

 - From: 3-node-IPv4-dst-100000
   To:   trex-sl-3n-ethip4-ip4dst100000

 - From: 3-node-IPv4-dst-10000
   To:   trex-sl-3n-ethip4-ip4dst10000

 - From: 3-node-IPv4-dst-1000
   To:   trex-sl-3n-ethip4-ip4dst1000

 - From: 3-node-IPv4-dst-100
   To:   trex-sl-3n-ethip4-ip4dst100

 - From: 3-node-IPv4-dst-1
   To:   trex-sl-3n-ethip4-ip4dst1

 - From: 3-node-IPv4
   To:   trex-sl-3n-ethip4-ip4src253

 - From: 3-node-IPv6-dst-1000000
   To:   trex-sl-3n-ethip6-ip6dst1000000

 - From: 3-node-IPv6-dst-100000
   To:   trex-sl-3n-ethip6-ip6dst100000

 - From: 3-node-IPv6-dst-10000
   To:   trex-sl-3n-ethip6-ip6dst10000

 - From: 3-node-IPv6
   To:   trex-sl-3n-ethip6-ip6src253

 - From: 3-node-xconnect
   To:   trex-sl-3n-ethip4-ip4src254

 - From: 3-node-IPv4-SNAT-1000u-15p
   To:   trex-sl-3n-ethip4udp-1000u15p

 - From: 3-node-IPv4-SNAT-100u-15p
   To:   trex-sl-3n-ethip4udp-100u15p

 - From: 3-node-IPv4-SNAT-10u-15p
   To:   trex-sl-3n-ethip4udp-10u15p

 - From: 3-node-IPv4-SNAT-1u-15p
   To:   trex-sl-3n-ethip4udp-1u15p

 - From: 3-node-IPv4-SNAT-1u-1p
   To:   trex-sl-3n-ethip4udp-1u1p

 - From: 3-node-IPv4-SNAT-2000u-15p
   To:   trex-sl-3n-ethip4udp-2000u15p

 - From: 3-node-IPv4-SNAT-4000u-15p
   To:   trex-sl-3n-ethip4udp-4000u15p

Change-Id: If6a3cf204c93ff9f2cdccc5fd395e26b05483b58
Signed-off-by: Tibor Frank <tifrank@cisco.com>