Revert "clean up testng dependencies in our subprojects (using 6.8.1)"

This reverts commit d5f096e2b423e7d87a7bfa86234c302ecce42962.
Revert "clean up hamcrest dependencies in our subprojects"

This reverts commit 66f5a6b34b2448bbdcdb63466a7d6879919ccae1.
updated testng dependency to 6.8.1
Merge branch 'dependencyUpdates' of https://github.com/alphaone/hmac-auth