Fix for drush 8.1.10 : drush rsync with two remote aliases fails because the aliases are not replaced

fix-rsync-with-two-remotes.patch

diff --git a/commands/core/rsync.core.inc b/commands/core/rsync.core.inc
index 4bc9dbb..66fef6b 100644
--- a/commands/core/rsync.core.inc
+++ b/commands/core/rsync.core.inc
@@ -228,6 +228,12 @@ function _drush_rsync_option_exists($option, $additional_options) {
 function _drush_core_rsync_both_remote($source, $destination, $additional_options, $source_path) {
   $options = $additional_options + drush_redispatch_get_options();
 
+  // We do not want to include root or uri here.  If the user
+  // provided -r or -l, their key has already been remapped to
+  // 'root' or 'uri' by the time we get here.
+  unset($options['root']);
+  unset($options['uri']);
+
   // Make a temporary directory to copy to.  There are three
   // cases to consider:
   //

I just copied the code used in sqlsync.drush.inc (which also needs rsync)