SUMO-228138: fix log levels

Previosly all provider logs were prefixed with DEBUG,
so logs were only shown after setting TF_LOG_PROVIDER=DEBUG, despite
having ERROR level

Ref: https://developer.hashicorp.com/terraform/plugin/log/writing#duplicate-timestamp-and-incorrect-level-messages

Author: mflis-sumo

main.go

@@ -3,12 +3,17 @@ package main
 import (
 	"github.com/SumoLogic/terraform-provider-sumologic/sumologic"
 	"github.com/hashicorp/terraform-plugin-sdk/plugin"
+	"log"
 )
 
 var version string // provider version is passed as compile time argument
 var defaultVersion = "dev"
 
 func main() {
+	// Remove any date and time prefix in log package function output to
+	// prevent duplicate timestamp and incorrect log level setting
+	// See: https://developer.hashicorp.com/terraform/plugin/log/writing#duplicate-timestamp-and-incorrect-level-messages
+	log.SetFlags(log.Flags() &^ (log.Ldate | log.Ltime))
 	if version == "" {
 		sumologic.ProviderVersion = defaultVersion
 	} else {