Addes test case to capture ebizzy workload in perf top tool

[Krishan-Saraswat]

To run this test, we need to follow this flow
start_ebizzy_workload -> run workload test -> stop_ebizzy_workload.

$avocado run --max-parallel-tasks=1 ebizzy_workload.py:test_start_ebizzy_workload
$ avocado run --max-parallel-tasks=1 perf_top.py:test_workload_output
$avocado run --max-parallel-tasks=1 ebizzy_workload.py:test_stop_ebizzy_workload

[sacsant]

If installation of any packages required by this test fails, this teardown function may error out since temp_file variable is defined after package install code. Ideally there should a check in teardown for if symbol/variable is available. Alternately the definition of this variable can be moved to the top of setup()

def tearDown(self):
if os.path.isfile(self.temp_file):
process.system('rm -f %s' % self.temp_file)