test: fix ordering of strictEqual actual/expected

Change all assert.strictEqual() to have actual value 1st
and expected value 2nd.

PR-URL: #16008
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>

test/sequential/test-regress-GH-784.js

@@ -21,7 +21,7 @@ const server = http.createServer(function(req, res) {
   });
 
   req.on('end', function() {
-    assert.strictEqual('PING', body);
+    assert.strictEqual(body, 'PING');
     res.writeHead(200);
     res.end('PONG');
   });
@@ -98,7 +98,7 @@ function ping() {
     });
 
     res.on('end', function() {
-      assert.strictEqual('PONG', body);
+      assert.strictEqual(body, 'PONG');
       assert.ok(!hadError);
       gotEnd = true;
       afterPing('success');
@@ -130,5 +130,5 @@ process.on('exit', function() {
   console.error("process.on('exit')");
   console.error(responses);
 
-  assert.strictEqual(8, responses.length);
+  assert.strictEqual(responses.length, 8);
 });