Decrease chance for random failure for unit/lib/request_spec.js

no issue

- this test fails sometimes, i recently increased the socket delay (maybe it was not enough)
- because these are milliseconds
- let's try 100ms

core/test/unit/lib/request_spec.js

@@ -148,7 +148,7 @@ describe('Request', function () {
 
         requestMock = nock('http://nofilehere.com')
             .get('/files/test.txt')
-            .socketDelay(15)
+            .socketDelay(100)
             .reply(408);
 
         result = request(url, options)