fix to work like copy module

library/cloud/gc_storage

@@ -263,7 +263,7 @@ def get_download_url(module, gs, bucket, obj, expiry):
 def handle_get(module, gs, bucket, obj, overwrite, dest):
     md5_remote = keysum(module, gs, bucket, obj)
     md5_local = hashlib.md5(open(dest, 'rb').read()).hexdigest()
-    if md5_local == md5_remote and not overwrite:
+    if md5_local == md5_remote:
         module.exit_json(changed=False)
     if md5_local != md5_remote and not overwrite:
         module.exit_json(msg="WARNING: Checksums do not match. Use overwrite parameter to force download.", failed=True)
@@ -279,8 +279,8 @@ def handle_put(module, gs, bucket, obj, overwrite, src, expiration):
     if bucket_rc and key_rc:
         md5_remote = keysum(module, gs, bucket, obj)
         md5_local = hashlib.md5(open(src, 'rb').read()).hexdigest()
-        if md5_local == md5_remote and not overwrite:
-            module.exit_json(msg="Local and remote object are identical. Use overwrite to force upload", changed=False)
+        if md5_local == md5_remote:
+            module.exit_json(msg="Local and remote object are identical", changed=False)
         if md5_local != md5_remote and not overwrite:
             module.exit_json(msg="WARNING: Checksums do not match. Use overwrite parameter to force upload.", failed=True)
         else: