Don't save compressed logs in cts-dev

- also explicitly print log path after test
- use gzip instead of zip: log files saved via testLog will only
  contain one file per call, therefore use of zip format is not
  necessary

Bug: 37217982
Test: cts-tradefed run cts-dev -m CtsGestureTestCases
  And verify that the generated logs are not compressed

Change-Id: Iad0538256ca09653ef7cfd1d52b493ba534fc32f
2 files changed