experiments: add nopaxos switch sequencer experiment

experiments/pyexps/qemu_nopaxos_swseq.py

+import modes.experiments as exp
+import modes.simulators as sim
+import modes.nodeconfig as node
+
+e = exp.Experiment('qemu-nopaxos-swseq')
+net = sim.NS3SequencerNet()
+e.add_network(net)
+
+class NOPaxosHost(sim.QemuHost):
+    disk_image = 'nopaxos'
+
+replicas = sim.create_basic_hosts(e, 3, 'replica', net, sim.CorundumBMNIC, NOPaxosHost,
+        node.CorundumLinuxNode, node.NOPaxosReplica)
+clients = sim.create_basic_hosts(e, 1, 'client', net, sim.CorundumBMNIC, NOPaxosHost,
+        node.CorundumLinuxNode, node.NOPaxosClient, ip_start = 4)
+
+for i in range(len(replicas)):
+    replicas[i].node_config.app.index = i
+    replicas[i].sleep = 1
+
+for c in clients:
+    c.node_config.app.server_ips = ['10.0.0.1', '10.0.0.2', '10.0.0.3']
+    c.wait = True
+
+experiments = [e]