[2.6] \r does not round-trip the local socket, escape and restore on the other side (#43507)

(cherry picked from commit 9169daa)

Co-authored-by: Nathaniel Case <this.is@nathanielca.se>

bin/ansible-connection

@@ -209,6 +209,8 @@ def main():
                 raise Exception("EOF found before vars data was complete")
             vars_data += cur_line
             cur_line = stdin.readline()
+        # restore escaped loose \r characters
+        vars_data = vars_data.replace(br'\r', b'\r')
 
         if PY3:
             pc_data = cPickle.loads(init_data, encoding='bytes')

lib/ansible/executor/task_executor.py

@@ -928,6 +928,8 @@ class TaskExecutor:
         stdin.write(b'\n#END_INIT#\n')
 
         src = cPickle.dumps(variables, protocol=0)
+        # remaining \r fail to round-trip the socket
+        src = src.replace(b'\r', br'\r')
         stdin.write(src)
         stdin.write(b'\n#END_VARS#\n')