PLT-4357 adding performance monitoring (#4622)

* WIP

* WIP

* Adding metrics collection

* updating vendor packages

* Adding metrics to config

* Adding admin console page for perf monitoring

* Updating glide

* switching to tylerb/graceful

api/apitestlib.go

@@ -36,7 +36,7 @@ func SetupEnterprise() *TestHelper {
 		*utils.Cfg.RateLimitSettings.Enable = false
 		utils.DisableDebugLogForTest()
 		utils.License.Features.SetDefaults()
-		NewServer(false)
+		NewServer()
 		StartServer()
 		utils.InitHTML()
 		InitApi()
@@ -57,7 +57,7 @@ func Setup() *TestHelper {
 		utils.Cfg.TeamSettings.MaxUsersPerTeam = 50
 		*utils.Cfg.RateLimitSettings.Enable = false
 		utils.DisableDebugLogForTest()
-		NewServer(false)
+		NewServer()
 		StartServer()
 		InitApi()
 		utils.EnableDebugLogForTest()