LTTng: Remove dependency to LttngKernelTrace in Lttng Kernel analysis module

LTTng: Remove dependency to LttngKernelTrace in Lttng Kernel analysis module

The helper's appliesToTraceType and the analysis's canExecute methods already
verify if a trace has the necessary requirements to be able to execute the
analysis and it shouldn't matter if it's not the same class.

Also added a unit test that tests the execution of the analysis itself.

Change-Id: Ifeb9ce54165c2ad2d8b8258c3f465a18433c4969
Signed-off-by: Geneviève Bastien <gbastien+lttng@versatic.net>
Reviewed-on: https://git.eclipse.org/r/25381
Reviewed-by: Marc-Andre Laperle <marc-andre.laperle@ericsson.com>
Tested-by: Marc-Andre Laperle <marc-andre.laperle@ericsson.com>
Tested-by: Hudson CI