subsystem: Change assert.equal to assert.strictEqual

Use asssert.strictEqual to enforce coersion.

Author: funkent

test/parallel/test-net-dns-custom-lookup.js

@@ -18,9 +18,9 @@ function check(addressType, cb) {
       family: addressType,
       lookup: lookup
     }).on('lookup', common.mustCall(function(err, ip, type) {
-      assert.equal(err, null);
-      assert.equal(address, ip);
-      assert.equal(type, addressType);
+      assert.strictEqual(err, null);
+      assert.strictEqual(address, ip);
+      assert.strictEqual(type, addressType);
     }));
   }));