tests: fix apm-integration tests failures due to newer agent making APM server version check (#122)

In [email protected] (elastic/apm-agent-nodejs#2546)
the APM agent added a default request to "GET /" of the APM server to
determine its version. This broke tests here.

Author: trentm

loggers/morgan/test/serve-one-http-req-with-apm.js

@@ -36,7 +36,8 @@ const apm = require('elastic-apm-node').start({
   serviceName: 'test-apm',
   centralConfig: false,
   captureExceptions: false,
-  metricsInterval: 0
+  metricsInterval: 0,
+  apmServerVersion: '8.2.0' // avoid APM server version check request
 })
 
 const app = require('express')()

loggers/pino/test/serve-one-http-req-with-apm.js

@@ -35,7 +35,8 @@ const apm = require('elastic-apm-node').start({
   serviceName: 'test-apm',
   centralConfig: false,
   captureExceptions: false,
-  metricsInterval: 0
+  metricsInterval: 0,
+  apmServerVersion: '8.2.0' // avoid APM server version check request
 })
 
 const http = require('http')

loggers/winston/test/serve-one-http-req-with-apm.js

@@ -35,7 +35,8 @@ const apm = require('elastic-apm-node').start({
   serviceName: 'test-apm',
   centralConfig: false,
   captureExceptions: false,
-  metricsInterval: 0
+  metricsInterval: 0,
+  apmServerVersion: '8.2.0' // avoid APM server version check request
 })
 
 const http = require('http')