Merge changes from topic "remove_default_prop"

* changes:
  Remove /system/etc/prop.default
  Remove /vendor/default.prop
diff --git a/tools/releasetools/common.py b/tools/releasetools/common.py
index 7805e30..42c29c0 100644
--- a/tools/releasetools/common.py
+++ b/tools/releasetools/common.py
@@ -803,8 +803,13 @@
     """Parses the build prop in a given import statement."""
 
     tokens = line.split()
-    if len(tokens) != 2 or tokens[0] != 'import':
+    if tokens[0] != 'import' or (len(tokens) != 2 and len(tokens) != 3) :
       raise ValueError('Unrecognized import statement {}'.format(line))
+
+    if len(tokens) == 3:
+      logger.info("Import %s from %s, skip", tokens[2], tokens[1])
+      return {}
+
     import_path = tokens[1]
     if not re.match(r'^/{}/.*\.prop$'.format(self.partition), import_path):
       raise ValueError('Unrecognized import path {}'.format(line))
diff --git a/tools/releasetools/ota_from_target_files.py b/tools/releasetools/ota_from_target_files.py
index 47ad3d8..ad001d1 100755
--- a/tools/releasetools/ota_from_target_files.py
+++ b/tools/releasetools/ota_from_target_files.py
@@ -267,7 +267,8 @@
 # 'system_other' and bootloader partitions.
 SECONDARY_PAYLOAD_SKIPPED_IMAGES = [
     'boot', 'dtbo', 'modem', 'odm', 'product', 'radio', 'recovery',
-    'system_ext', 'vbmeta', 'vbmeta_system', 'vbmeta_vendor', 'vendor']
+    'system_ext', 'vbmeta', 'vbmeta_system', 'vbmeta_vendor', 'vendor',
+    'vendor_boot']
 
 
 class PayloadSigner(object):