Make things generally quieter.

* Give run-test a --quiet flag that causes it to only print on errors.
* Give cpplint a --quiet flag that causes it to not print anything
  when there are no errors.
* Add a ART_TEST_QUIET flag to build/Android.common_test.mk which
  makes run-test targets much quieter when true (the default). With
  this flag only failures will be printed.
* Make build/Android.cpplint.mk pass the new cpplint --quiet flag so
  that only failures will be printed.

Before:
    [ 96% 5715/5906] build test-art-host-run-test-debug-prebuild-interpreter-relocate-ntrace-cms-checkjni-image-npictest-ndebuggable-461-get-reference-vreg32
    test-art-host-run-test-debug-prebuild-interpreter-relocate-ntrace-cms-checkjni-image-npictest-ndebuggable-448-multiple-returns32 RUNNING
    /usr/local/google/buildbot/src/googleplex-android/master-art-host/art/test/448-multiple-returns: building...
    /usr/local/google/buildbot/src/googleplex-android/master-art-host/art/test/448-multiple-returns: running...
    /usr/local/google/buildbot/src/googleplex-android/master-art-host/art/test/448-multiple-returns: succeeded!
    test-art-host-run-test-debug-prebuild-interpreter-relocate-ntrace-cms-checkjni-image-npictest-ndebuggable-448-multiple-returns32 PASSED

After:
    [ 96% 5715/5906] build test-art-host-run-test-debug-prebuild-interpreter-relocate-ntrace-cms-checkjni-image-npictest-ndebuggable-461-get-reference-vreg32

Change-Id: Idf6fce7f48a619f83254b48861dbd7f8eb4ebdbf
5 files changed