Update language to comply with Android's inclusive language guidance

See https://source.android.com/setup/contribute/respectful-code
for reference.

Bug: 161896447
Test: cd packages/modules/DnsResolver && atest

Change-Id: Ic2136aa5e0c361794edb139ab2133146e6e37edb
diff --git a/tests/resolv_integration_test.cpp b/tests/resolv_integration_test.cpp
index f44a0b5..716dc71 100644
--- a/tests/resolv_integration_test.cpp
+++ b/tests/resolv_integration_test.cpp
@@ -469,7 +469,7 @@
     constexpr char name_ip6_dot[] = "ip6-localhost.";
     constexpr char name_ip6_fqdn[] = "ip6-localhost.example.com.";
 
-    // Add a dummy nameserver which shouldn't receive any queries
+    // Add a no-op nameserver which shouldn't receive any queries
     test::DNSResponder dns;
     StartDns(dns, {});
     ASSERT_TRUE(mDnsClient.SetResolversForNetwork());
@@ -518,7 +518,7 @@
 }
 
 TEST_F(ResolverTest, GetHostByName_numeric) {
-    // Add a dummy nameserver which shouldn't receive any queries
+    // Add a no-op nameserver which shouldn't receive any queries
     test::DNSResponder dns;
     StartDns(dns, {});
     ASSERT_TRUE(mDnsClient.SetResolversForNetwork());
@@ -699,7 +699,7 @@
 }
 
 TEST_F(ResolverTest, GetAddrInfo_localhost) {
-    // Add a dummy nameserver which shouldn't receive any queries
+    // Add a no-op nameserver which shouldn't receive any queries
     test::DNSResponder dns;
     StartDns(dns, {});
     ASSERT_TRUE(mDnsClient.SetResolversForNetwork());
@@ -2048,8 +2048,8 @@
     if (revents & POLLIN) {
         int n = resNetworkResult(fd, rcode, buf, bufLen);
         // Verify that resNetworkResult() closed the fd
-        char dummy;
-        EXPECT_EQ(-1, read(fd, &dummy, sizeof dummy));
+        char unused;
+        EXPECT_EQ(-1, read(fd, &unused, sizeof unused));
         EXPECT_EQ(EBADF, errno);
         return n;
     }
@@ -5269,7 +5269,7 @@
   private:
     // Use a different netId because this class inherits from the class ResolverTest which
     // always creates TEST_NETID in setup. It's incremented when CreateScopedNetwork() is called.
-    // Note: Don't create more than 20 networks in the class since 51 is used for the dummy network.
+    // Note: Don't create more than 20 networks in the class since 51 is used for the mock network.
     unsigned mNextNetId = 31;
 };