Collect tcpdump when failed for wifi related tests

This CL has below changes:
- Modify tcpdump related utility functions in net_test_utils.
  Including clean up unused variables, split dump file to
  prevent a unreadable large file, add necessary parameters.
- Add codes of tcpdump collection for wifi base test classes
  (WifiBaseTest, WifiP2pBaseTest, AwareBaseTest, RttBaseTest)

Bug: 165446308
Test: Run AU drop tests
Change-Id: I3c80161108747a4f97b4ced060206046ba043c8c
7 files changed
tree: b884ef109d1d233566194e1a04ab19dc99bc1e05
  1. acts/
  2. acts_tests/
  3. tools/
  4. wts-acts/
  5. Android.mk
  6. OWNERS
  7. PREUPLOAD.cfg