fix: dev: Change parser library
fix: dev: Change parser library

Changed parser.py function parse_show_lacp_interface to fix 2 things:
1. When used against a static LAG member, the parser causes the
 script to freeze
2. When used against a static LAG member, remote_system_id and
 local_system_id where set to None instead of empty text

Change-Id: I5208bf4e32772e5d01821ddc444c861fed187deb
Signed-off-by: Jose Hernandez <4685731dd137d290951b81fc2221bb8b78f03740@hpe.com>

open-switch/ops-topology-lib-vtysh