fix PUT w/ X-Copy-From for symlink=get

copy.patch

diff --git a/swift/common/middleware/copy.py b/swift/common/middleware/copy.py
index b66ab9d..26a1649 100644
--- a/swift/common/middleware/copy.py
+++ b/swift/common/middleware/copy.py
@@ -327,10 +327,10 @@ class ServerSideCopyMiddleware(object):
         source_req.headers['X-Newest'] = 'true'
 
         # in case we are copying an SLO manifest, set format=raw parameter
-        params = source_req.params
-        if params.get('multipart-manifest') == 'get':
-            params['format'] = 'raw'
-            source_req.params = params
+        if req.params.get('multipart-manifest') == 'get':
+            source_req.params['format'] = 'raw'
+        if req.params.get('symlink') == 'get':
+            source_req.params['symlink'] = 'get'
 
         source_resp = ssc_ctx.get_source_resp(source_req)