Refresh Flimflam Interface when used in chromeos_network.py
Refresh Flimflam Interface when used in chromeos_network.py

The flimflam interface may change mid-test as we bring up and down
flimflam through the CleanFlimflamDir suid_action.  This causes
the dbus interface to change.  We should get a new interface
everytime we access flimflam to make a dbus call so we don't
run into errors.

TEST=run chromeos_wifi_sanity.py
BUG=None

Change-Id: Ied7d66678e2bb1e8cfa700e4810e79c92c4484c5


Review URL: http://codereview.chromium.org/9703092

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@127387 0039d316-1c4b-4281-b951-d872f2087c98

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