releasetools: Prepend 'ota-' to 'streaming-property-files'.

'streaming-property-files' is a property related to the OTA package
itself. Prepend 'ota-' to make it consistent with others like
'ota-type' and 'ota-required-cache'.

Bug: 34852392
Test: Generate an A/B OTA package and check METADATA entry.
Change-Id: Ia681e6e19ff509e6da0d8718933b42aac997e1cf
diff --git a/tools/releasetools/ota_from_target_files.py b/tools/releasetools/ota_from_target_files.py
index 7310470..bd033eb 100755
--- a/tools/releasetools/ota_from_target_files.py
+++ b/tools/releasetools/ota_from_target_files.py
@@ -1418,7 +1418,8 @@
   # Open the signed zip. Compute the metadata that's needed for streaming.
   output_zip = zipfile.ZipFile(temp_signing, "a",
                                compression=zipfile.ZIP_DEFLATED)
-  metadata['streaming-property-files'] = ComputeStreamingMetadata(output_zip)
+  metadata['ota-streaming-property-files'] = ComputeStreamingMetadata(
+      output_zip)
 
   # Write the metadata entry into the zip.
   WriteMetadata(metadata, output_zip)
@@ -1432,7 +1433,7 @@
 
   # Reopen the signed zip to double check the streaming metadata.
   output_zip = zipfile.ZipFile(output_file, "r")
-  assert (metadata['streaming-property-files'] ==
+  assert (metadata['ota-streaming-property-files'] ==
           ComputeStreamingMetadata(output_zip)), \
               "Mismatching streaming metadata."
   common.ZipClose(output_zip)