WifiDiagnostics: test a log call

Use WifiDiagnosticss to add an example of how to
test logging calls.

And to facilitate this: add a makeLog() method
to WifiInjector.

BUG=30566702
TEST=wifitests/runtests.sh

Change-Id: I46ebd8e79c90bce4bb75c077a6e6cc2b0aa9d3ee
3 files changed
tree: de31e53366456cbf4af1966bed334415a7284d0e
  1. libwifi_hal/
  2. libwifi_system/
  3. service/
  4. tests/