pep8: fix E305 (2 blank lines after functions)

pep8 2.2.0 fixes E305 check, which currently causes
our check_format.sh to fail.

Checking Python style... Python formatting errors detected
test/lvol/lvol_test.py:12:1: E305 expected 2 blank lines after class or
function definition, found 1
test/vhost/common/run_fio.py:160:1: E305 expected 2 blank lines after
class or function definition, found 1

E305 differs from E302 as follows:
* E302    expected 2 blank lines, found 0
* E305    expected 2 blank lines after end of function or class

Change-Id: I2f6c3e1fa9fcb1b2c6d26690c1c65f39d7447875
Signed-off-by: Dariusz Stojaczyk <dariuszx.stojaczyk@intel.com>
Reviewed-on: https://review.gerrithub.io/405208
Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Daniel Verkamp <daniel.verkamp@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>

test/lvol/lvol_test.py

@@ -9,6 +9,7 @@ def check_fail_count(fail_count, num_test):
     else:
         print("Test: {num_test} - FAIL".format(num_test=num_test))
 
+
 if __name__ == "__main__":
     rpc_py = None
     total_size = None

test/vhost/common/run_fio.py

@@ -157,5 +157,6 @@ def main():
     print("Running job file: {0}".format(fio_cfg))
     run_fio(vms, fio_cfg, out_dir, perf_vmex)
 
+
 if __name__ == "__main__":
     sys.exit(main())