jjb: lava: kprobe-fuzzing: Split testcase into multiple independent ones

jjb: lava: kprobe-fuzzing: Split testcase into multiple independent ones

With the current configuration, the fuzzing is done in a single Lava
testcase. If the kernel crashes during the testcase, the Lava slave will
be rebooted once the timeout expires(currently 2 hours). If the testcase
crashes at the beginning of the testcase, the job still has to wait for
the timeout to expire. That causes a lot of wasted time.

We overcome this by split the fuzzing into multiple smaller testcases
all with a smaller timeout and a specific range of instrumentation
points to test. This has the benefits of increasing our testing coverage
and resource efficiency.

Signed-off-by: Francis Deslauriers <francis.deslauriers@efficios.com>