Add "get total flows" endpoint

[konstantinos-papadopoulos]

For testing new functionality

1. launch ie three workers with IPs 192.168.100.21,192.168.100.22,192.168.100.23
2. bin/deploy --json-config config/config.json
3. bin/handlers/init_topos --json-config config/config.json
4. bin/handlers/start_topos --json-config config/config.json

add some flows to the switches of each worker ie if 10 switches per worker and number of workers =3

Worker 1

sudo ovs-ofctl -O OpenFlow13 add-flow 1 'priority=2,icmp,actions=CONTROLLER:65535'
sudo ovs-ofctl -O OpenFlow13 add-flow 1 'priority=2,ip,actions=CONTROLLER:65535'
sudo ovs-ofctl -O OpenFlow13 add-flow 1 'priority=2,arp,actions=CONTROLLER:65535'

Worker 3

sudo ovs-ofctl -O OpenFlow13 add-flow 21 'priority=2,icmp,actions=CONTROLLER:65535'
sudo ovs-ofctl -O OpenFlow13 add-flow 22 'priority=2,ip,actions=CONTROLLER:65535'
sudo ovs-ofctl -O OpenFlow13 add-flow 23 'priority=2,arp,actions=CONTROLLER:65535'

1. bin/handlers/get_flows --json-config config/config.json

Results should be

["{\"dpid-0\": 3}", "{\"dpid-1\": 0}", "{\"dpid-2\": 3}"]

[konstantinos-papadopoulos]

Under file ''multinet/multinet_src/multi/worker.py' l.107

> dpid_key = 'number-of-flows-on-worker-{0}'.format(MININET_TOPO._dpid_offset)

Results should be

["{\"number-of-flows-on-worker-0\": 3}", "{\"number-of-flows-on-worker-1\": 0}", "{\"number-of-flows-on-worker-2\": 3}"]

Should now be ok