test,repl: use deepStrictEqual for false-y values

PR-URL: #6196
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Minwoo Jung <jmwsoft@gmail.com>

test/parallel/test-repl-tab-complete.js

@@ -178,7 +178,7 @@ var spaceTimeout = setTimeout(function() {
 }, 1000);
 
 testMe.complete(' ', common.mustCall(function(error, data) {
-  assert.deepEqual(data, [[], undefined]);
+  assert.deepStrictEqual(data, [[], undefined]);
   clearTimeout(spaceTimeout);
 }));
 
@@ -257,5 +257,5 @@ putIn.run(['.clear']);
 putIn.run(['function a() {}']);
 
 testMe.complete('a().b.', common.mustCall((error, data) => {
-  assert.deepEqual(data, [[], undefined]);
+  assert.deepStrictEqual(data, [[], undefined]);
 }));