python: Resolve pep8 blank line errors.

Resolve pep8 errors E302 and E303:

  E302 expected 2 blank lines, found 1
  E303 too many blank lines (3)

Signed-off-by: Russell Bryant <russell@ovn.org>
Acked-by: Ben Pfaff <blp@ovn.org>

python/ovstest/args.py

@@ -24,6 +24,7 @@ import sys
 CONTROL_PORT = 15531
 DATA_PORT = 15532
 
+
 def ip_address(string):
     """Verifies if string is a valid IP address"""
     try:
@@ -246,6 +247,7 @@ def ovs_initialize_args():
                 'OuterIP.')
     return parser.parse_args()
 
+
 def l3_initialize_args():
     """
     Initialize argument parsing for ovs-l3ping utility.

python/ovstest/tests.py

@@ -139,7 +139,6 @@ def do_l3_tests(node1, node2, bandwidth, duration, ps, type):
             server.del_bridge(DEFAULT_TEST_BRIDGE)
 
 
-
 def do_vlan_tests(node1, node2, bandwidth, duration, ps, tag):
     """
     Do VLAN tests between node1 and node2. Each node is given

python/ovstest/vswitch.py

@@ -33,6 +33,7 @@ def ovs_vsctl_del_bridge(bridge):
     ret, _out, _err = util.start_process(["ovs-vsctl", "del-br", bridge])
     return ret
 
+
 def ovs_vsctl_del_pbridge(bridge, iface):
     """
     This function deletes the OVS bridge and assigns the bridge IP address