Save log.tag as well while running test

Bug: 379667769
Test: setprop log.tag aaaa
setprop persist.log.tag bbbb
run `liblog_device_preparer.sh setup` and check the two sysprops are
reset.
run `liblog_device_preparer.sh teardown` and check the two sysprops are
restored.

Change-Id: I99bc8826cd7c3d1f55b5e6b6a3d0a6276af4e3d8
1 file changed
tree: 94775d1ba7c954418b62f7b9db805840f4f6a6a5
  1. liblog/
  2. logcat/
  3. logd/
  4. logwrapper/
  5. rust/
  6. OWNERS
  7. PREUPLOAD.cfg
  8. TEST_MAPPING