tests: refactor. Replace literal constant w/ named constant.

* change literal packet count vlaues from 65 to a named constant of 67.
  (This value was recommended to exercise single, dual, and quad loops)

Change-Id: Ieb1738dddacb8b6ea7fa25883032ac01a98399e1
Signed-off-by: Paul Vinciguerra <pvinci@vinciconsulting.com>
diff --git a/test/test_pipe.py b/test/test_pipe.py
index 6a0b4a0..20e6d2a 100644
--- a/test/test_pipe.py
+++ b/test/test_pipe.py
@@ -10,6 +10,8 @@
 from vpp_interface import VppInterface
 from vpp_ip_route import VppIpTable, VppIpRoute, VppRoutePath
 
+NUM_PKTS = 67
+
 
 class VppPipe(VppInterface):
     """
@@ -114,8 +116,8 @@
              UDP(sport=1234, dport=1234) /
              Raw('\xa5' * 100))
 
-        self.send_and_expect(self.pg0, p * 65, self.pg1)
-        self.send_and_expect(self.pg1, p * 65, self.pg0)
+        self.send_and_expect(self.pg0, p * NUM_PKTS, self.pg1)
+        self.send_and_expect(self.pg1, p * NUM_PKTS, self.pg0)
 
         #
         # Attach ACL to ensure features are run on the pipe
@@ -138,8 +140,8 @@
         self.vapi.acl_interface_set_acl_list(pipes[0].east,
                                              0,
                                              [acl.acl_index])
-        self.send_and_assert_no_replies(self.pg0, p * 65)
-        self.send_and_expect(self.pg1, p * 65, self.pg0)
+        self.send_and_assert_no_replies(self.pg0, p * NUM_PKTS)
+        self.send_and_expect(self.pg1, p * NUM_PKTS, self.pg0)
 
         # remove from output and apply on input
         self.vapi.acl_interface_set_acl_list(pipes[0].east,
@@ -148,13 +150,13 @@
         self.vapi.acl_interface_set_acl_list(pipes[0].west,
                                              1,
                                              [acl.acl_index])
-        self.send_and_assert_no_replies(self.pg0, p * 65)
-        self.send_and_expect(self.pg1, p * 65, self.pg0)
+        self.send_and_assert_no_replies(self.pg0, p * NUM_PKTS)
+        self.send_and_expect(self.pg1, p * NUM_PKTS, self.pg0)
         self.vapi.acl_interface_set_acl_list(pipes[0].west,
                                              0,
                                              [])
-        self.send_and_expect(self.pg0, p * 65, self.pg1)
-        self.send_and_expect(self.pg1, p * 65, self.pg0)
+        self.send_and_expect(self.pg0, p * NUM_PKTS, self.pg1)
+        self.send_and_expect(self.pg1, p * NUM_PKTS, self.pg0)
 
         #
         # L3 routes in two separate tables so a pipe can be used to L3
@@ -205,13 +207,13 @@
         self.vapi.sw_interface_set_table(pipes[1].east, 0, 1)
 
         # IP is not enabled on the pipes at this point
-        self.send_and_assert_no_replies(self.pg2, p_east * 65)
+        self.send_and_assert_no_replies(self.pg2, p_east * NUM_PKTS)
 
         # IP enable the Pipes by making them unnumbered
         pipes[0].set_unnumbered(self.pg2.sw_if_index)
         pipes[1].set_unnumbered(self.pg3.sw_if_index)
 
-        self.send_and_expect(self.pg2, p_east * 65, self.pg3)
+        self.send_and_expect(self.pg2, p_east * NUM_PKTS, self.pg3)
 
         # and the return path
         p_west = (Ether(src=self.pg3.remote_mac,
@@ -220,7 +222,7 @@
                      dst="1.1.1.2") /
                   UDP(sport=1234, dport=1234) /
                   Raw('\xa5' * 100))
-        self.send_and_expect(self.pg3, p_west * 65, self.pg2)
+        self.send_and_expect(self.pg3, p_west * NUM_PKTS, self.pg2)
 
         #
         # Use ACLs to test features run on the Pipes
@@ -228,8 +230,8 @@
         self.vapi.acl_interface_set_acl_list(pipes[1].east,
                                              0,
                                              [acl.acl_index])
-        self.send_and_assert_no_replies(self.pg2, p_east * 65)
-        self.send_and_expect(self.pg3, p_west * 65, self.pg2)
+        self.send_and_assert_no_replies(self.pg2, p_east * NUM_PKTS)
+        self.send_and_expect(self.pg3, p_west * NUM_PKTS, self.pg2)
 
         # remove from output and apply on input
         self.vapi.acl_interface_set_acl_list(pipes[1].east,
@@ -238,13 +240,13 @@
         self.vapi.acl_interface_set_acl_list(pipes[1].west,
                                              1,
                                              [acl.acl_index])
-        self.send_and_assert_no_replies(self.pg2, p_east * 65)
-        self.send_and_expect(self.pg3, p_west * 65, self.pg2)
+        self.send_and_assert_no_replies(self.pg2, p_east * NUM_PKTS)
+        self.send_and_expect(self.pg3, p_west * NUM_PKTS, self.pg2)
         self.vapi.acl_interface_set_acl_list(pipes[1].west,
                                              0,
                                              [])
-        self.send_and_expect(self.pg2, p_east * 65, self.pg3)
-        self.send_and_expect(self.pg3, p_west * 65, self.pg2)
+        self.send_and_expect(self.pg2, p_east * NUM_PKTS, self.pg3)
+        self.send_and_expect(self.pg3, p_west * NUM_PKTS, self.pg2)
 
         # cleanup (so the tables delete)
         self.pg2.unconfig_ip4()