OffloadUtils - Introduce 'EGRESS' and 'INGRESS' helper constants.

Makes things a tad easier to read.

Test: builds, atest
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: Ibb4844a1d47b43dbd3c33ed942528d3e3b7de44a
diff --git a/server/OffloadUtilsTest.cpp b/server/OffloadUtilsTest.cpp
index 6bfe52c..7a21a94 100644
--- a/server/OffloadUtilsTest.cpp
+++ b/server/OffloadUtilsTest.cpp
@@ -247,19 +247,19 @@
 }
 
 TEST_F(OffloadUtilsTest, CheckAttachBpfFilterRawIpClsactEgressLo) {
-    checkAttachDetachBpfFilterClsactLo(/*ingress*/ false, RAWIP);
+    checkAttachDetachBpfFilterClsactLo(EGRESS, RAWIP);
 }
 
 TEST_F(OffloadUtilsTest, CheckAttachBpfFilterEthernetClsactEgressLo) {
-    checkAttachDetachBpfFilterClsactLo(/*ingress*/ false, ETHER);
+    checkAttachDetachBpfFilterClsactLo(EGRESS, ETHER);
 }
 
 TEST_F(OffloadUtilsTest, CheckAttachBpfFilterRawIpClsactIngressLo) {
-    checkAttachDetachBpfFilterClsactLo(/*ingress*/ true, RAWIP);
+    checkAttachDetachBpfFilterClsactLo(INGRESS, RAWIP);
 }
 
 TEST_F(OffloadUtilsTest, CheckAttachBpfFilterEthernetClsactIngressLo) {
-    checkAttachDetachBpfFilterClsactLo(/*ingress*/ true, ETHER);
+    checkAttachDetachBpfFilterClsactLo(INGRESS, ETHER);
 }
 
 }  // namespace net