Merge branch 'sk/unit-test-oid'

Convert a few unit tests to the clar framework. * sk/unit-test-oid: t/unit-tests: convert oidtree test to use clar test framework t/unit-tests: convert oidmap test to use clar test framework t/unit-tests: convert oid-array test to use clar test framework t/unit-tests: implement clar specific oid helper functions