Fix flaky testTcpBufferReset

If EVENT_NETWORK_INFO_CHANGED was handled after waitForIdle()
method done, this test will be failed due to
INetd#setTcpRWmemorySize() was not executed yet. Instead of
waiting for idle state, it's better to use NetworkCallback to
ensure events completely on ConnectivityService.

Bug: 140206578
Test: atest ConnectivityServiceTest#testTcpBufferReset\
      --generate-new-metrics 500

Change-Id: Iad77415db38038603881d9ebe0e37586b549a45c
1 file changed
tree: f3e0901f7768edb4fbbde7f7a50681f5ecb14f81
  1. core/
  2. services/
  3. tests/