Added support to telnetlib

[dineshbaburam91]

Used the telnetlib.py from python source code to fix telnetlib dependency in junos-eznc.

It is temporary fix till it support exscript or telnetlib3 in junos-eznc.

(pyez_vir)  % python3.13 tel_ex.py
INFO:jnpr.junos.tty:TTY: connecting to TTY:x.x.x.x:23 ...
INFO:jnpr.junos.tty:TTY: logging in......
INFO:jnpr.junos.tty:TTY: OK.....starting NETCONF
INFO:jnpr.junos.console:facts: retrieving device facts...
INFO:jnpr.junos.tty_netconf:Calling rpc: b'<rpc><get-route-engine-information/></rpc>'
INFO:jnpr.junos.tty_netconf:Calling rpc: b'<rpc><file-list><path>~</path></file-list></rpc>'
INFO:jnpr.junos.tty_netconf:Calling rpc: b'<rpc><get-chassis-inventory/></rpc>'
INFO:jnpr.junos.tty_netconf:Calling rpc: b'<rpc><file-show><filename>/usr/share/cevo/cevo_version</filename></file-show></rpc>'
INFO:jnpr.junos.tty_netconf:Calling rpc: b'<rpc><get-interface-information><routing-instance>__juniper_private1__</routing-instance><terse/></get-interface-information></rpc>'
INFO:jnpr.junos.tty_netconf:Calling rpc: b'<rpc><file-show><filename>/etc/hosts.junos</filename></file-show></rpc>'
INFO:jnpr.junos.tty_netconf:Calling rpc: b'<rpc><get-configuration database="committed" inherit="inherit" commit-scripts="apply"><configuration>\n            <system>\n                <domain-name/>\n             </system>\n        </configuration></get-configuration></rpc>'
INFO:jnpr.junos.tty_netconf:Calling rpc: b'<rpc><command>show version invoke-on all-routing-engines</command></rpc>'
INFO:jnpr.junos.tty_netconf:Calling rpc: b'<rpc><get-virtual-chassis-information/></rpc>'
INFO:jnpr.junos.tty_netconf:Calling rpc: b'<rpc><get-chassis-cluster-status/></rpc>'
INFO:jnpr.junos.tty_netconf:Calling rpc: b'<rpc><get-ethernet-switching-table-information><summary/></get-ethernet-switching-table-information></rpc>'
INFO:jnpr.junos.tty_netconf:Calling rpc: b'<rpc><command>show bridge mac-table count</command></rpc>'
INFO:jnpr.junos.tty_netconf:Calling rpc: b'<rpc><request-shell-execute><command>sysctl -n hw.re.vmhost_mode</command></request-shell-execute></rpc>'
{'2RE': True, 'HOME': '/var/home/regress', 'RE0': {'mastership_state': 'master', 'status': 'OK', 'model': 'RE-S-1800x4', 'last_reboot_reason': 'Router rebooted after a normal shutdown.', 'up_time': '3 hours, 2 minutes, 49 seconds'}, 'RE1': {'mastership_state': 'Present', 'status': None, 'model': None, 'last_reboot_reason': None, 'up_time': None}, 'RE_hw_mi': False, 'current_re': ['re0', 'master', 'node', 'fwdd', 'member', 'pfem'], 'domain': 'juniper.net', 'fqdn': 'sandalwood.englab.juniper.net', 'hostname': 'x.x.x.x', 'hostname_info': {'re0': 'x.x.x.x'}, 'ifd_style': 'CLASSIC', 'junos_info': {'re0': {'text': '25.2, 'object': junos.version_info(major=(25, 2), type=I, minor=2025, build=None)}}, 'master': 'RE0', 'model': 'MX480', 'model_info': {'re0': 'MX480'}, 'personality': 'MX', 're_info': {'default': {'0': {'mastership_state': 'master', 'status': 'OK', 'model': 'RE-S-1800x4', 'last_reboot_reason': 'Router rebooted after a normal shutdown.'}, '1': {'mastership_state': 'Present', 'status': None, 'model': None, 'last_reboot_reason': None}, 'default': {'mastership_state': 'master', 'status': 'OK', 'model': 'RE-S-1800x4', 'last_reboot_reason': 'Router rebooted after a normal shutdown.'}}}, 're_master': {'default': '0'}, 'serialnumber': 'JN123', 'srx_cluster': None, 'srx_cluster_id': None, 'srx_cluster_redundancy_group': None, 'switch_style': 'BRIDGE_DOMAIN', 'vc_capable': False, 'vc_fabric': None, 'vc_master': None, 'vc_mode': None, 'version': '25.2I', 'version_RE0': '25.2', 'version_RE1': None, 'version_info': junos.version_info(major=(25, 2), type=I, minor=20250127_, build=None), 'virtual': False, 'vmhost': False}
INFO:jnpr.junos.tty:logout: logging out.....
INFO:jnpr.junos.tty_netconf:Calling rpc: b'<rpc><close-session/></rpc>'