Add iperf util and update call in active data session tests.

- Add iperf util in tel_test_util.
- Update call in active data session test to use iperf if curl
  is not supported
- Insert wait time before call attempt to ensure data session
  is active
- Fix the typo in TelLivePostflightTest

Test: run test in the lab
Bug: 36187843
Change-Id: Ie9c12a49ce3b6bb482f995a0cbe24e79d724f8a6
4 files changed
tree: 8acd2c0547f95c249e12488a6e91f06a797ea786
  2. PREUPLOAD.cfg
  3. acts/
  4. tools/