* Move the stress test code to being a TestContainers-based test.
Upgrade testcontainers version to work with the latest docker-for-mac.
Add metrics in the OTLP exporter, to record success/failure of export.
Use the TestContainers annotation to disable those tests when docker isn't present.
* remove a bunch of commented out stuff that shouldn't have been added
* disable the test without docker
* use specific docker image tags to keep testcontainers from downloading the world
* delete unneeded file
* fix from upstream change
* switch to java 8
* update the READMEs and use Object.equals in a couple of cases to test that we're really compiling for java 8/android 24.
* formatting
* use the newer release options for the build, and change the int test to not be java 7 any more.
* switch back to source/target compatibility
* sure wish I could run docker locally to test this out.
Anuraag Agrawal
John Watson
dengliming