Ci: unit test are not running for stable v2.8 and greater
Since 2.8 the unit_test test descriptor under the test/ folder was removed since we moved to the autotools tap harness.
The ci jobs did not get updated and simply fail to run unit test.
19:15:40 + prove --merge -v --exec '' - --archive /home/jenkins/workspace/lttng-tools_master_build/arch/x86-32/babeltrace_version/master/build/std/conf/std/liburcu_version/master/tap/unit/
19:15:40 /tmp/hudson6487886163425871557.sh: line 247: /home/jenkins/workspace/lttng-tools_master_build/arch/x86-32/babeltrace_version/master/build/std/conf/std/liburcu_version/master/tests/unit_tests: No such file or directory
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