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.

mininet/topo.py

@@ -63,7 +63,7 @@ class Topo(object):
         return result
 
     def addLink(self, node1, node2, port1=None, port2=None,
-                 **opts):
+                **opts):
         """node1, node2: nodes to link together
            port1, port2: ports (optional)
            opts: link options (optional)
@@ -205,7 +205,7 @@ class SingleSwitchReversedTopo(Topo):
         for h in irange(1, k):
             host = self.addHost('h%s' % h)
             self.addLink(host, switch,
-                          port1=0, port2=(k - h + 1))
+                         port1=0, port2=(k - h + 1))
 
 class LinearTopo(Topo):
     "Linear topology of k switches, with one host per switch."