Update request.go to fix concurrency nonce issues (#285)

* Updates nonce generation to adhere to fifo channel buffer before request executes by routine

* removed unused variables, lns etc

* Fix requested changes and added in timer that disengages lock if out of scope error occurs

* Fixed woopsy daisy issue

* Add benchmark, reduce time in force to unlock before stack insertion, add nil check for edge case

* Remove unusued waitgroup field

* use return nonce.Value and method, rm redundant nonce code, fix tests.

* Fix linter issue: unnecessary conversion

testdata/configtest.json

@@ -1319,5 +1319,19 @@
    "supportedExchanges": "ANX,Kraken"
   }
  ],
+ "connectionMonitor": {
+  "preferredDNSList": [
+   "8.8.8.8",
+   "8.8.4.4",
+   "1.1.1.1",
+   "1.0.0.1"
+  ],
+  "preferredDomainList": [
+   "www.google.com",
+   "www.cloudflare.com",
+   "www.facebook.com"
+  ],
+  "checkInterval": 1000000000
+ },
  "fiatDispayCurrency": ""
 }