[WifiManagerTest] Start and stop iperf server before running traffic

CHERRY PICKED CHANGES FROM AOSP

Bug: 64912064
Test: Verified the iperf related tests
Change-Id: I5d982b9465a1ed37ad13079e22b892c8f902f53d
Merged-In: Idcd488266d5d2a1e304f68da871f173f4cac2394
1 file changed
tree: 03da34ded12ca5d8b5ea61b5998ebc74242c5722
  1. acts/
  2. tools/
  3. Android.mk
  4. PREUPLOAD.cfg