- adds missing imports following commit triage

Author: baywet

src/main/java/com/microsoft/graph/http/CoreHttpProvider.java

@@ -31,6 +31,7 @@
 import java.io.UnsupportedEncodingException;
 import java.net.URL;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -58,6 +59,7 @@
 import okhttp3.Headers;
 import okhttp3.MediaType;
 import okhttp3.OkHttpClient;
+import okhttp3.Protocol;
 import okhttp3.Request;
 import okhttp3.RequestBody;
 import okhttp3.Response;