pep8: Fix E127 continuation line over-indented

There are a bunch of these remaining, but I don't think the right course is
to 'fix' all of them to make pep8 happy, but instead to either change
the test in pep8 to consider that a continuation line may itself
be continued halfway, OR, to change the code in these lines to be more
readable by removing the need for all those nested continuations.

Personally, I find multiply-broken lines (aka nested continuations) really
hard to read.

examples/simpleperf.py

@@ -19,10 +19,10 @@ class SingleSwitchTopo(Topo):
         for h in range(n):
             # Each host gets 50%/n of system CPU
             host = self.addHost('h%s' % (h + 1),
-                                 cpu=.5 / n)
+                                cpu=.5 / n)
             # 10 Mbps, 5ms delay, 10% loss
             self.addLink(host, switch,
-                          bw=10, delay='5ms', loss=10, use_htb=True)
+                         bw=10, delay='5ms', loss=10, use_htb=True)
 
 def perfTest():
     "Create network and run simple performance test"