Why I did it
Currently the show and clear cli of dhcp_relayis may cause confusion.
How I did it
Add doc for it: [doc] Add docs for dhcp_relay show/clear cli sonic-utilities#2649
Add dhcp_relay config cli and test cases.
show dhcp_relay ipv4 helper
show dhcp_relay ipv6 destination
show dhcp_relay ipv6 counters
sonic-clear dhcp_relay ipv6 counters
How to verify it
Unit test all passed
Avoid traceback on sonic-clear command
sonic-clear dhcp6relay_counters
Traceback (most recent call last):
File "/usr/local/bin/sonic-clear", line 8, in <module>
sys.exit(cli())
File "/usr/local/lib/python3.9/dist-packages/click/core.py", line 764, in __call__
return self.main(*args, **kwargs)
File "/usr/local/lib/python3.9/dist-packages/click/core.py", line 717, in main
rv = self.invoke(ctx)
File "/usr/local/lib/python3.9/dist-packages/click/core.py", line 1137, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File "/usr/local/lib/python3.9/dist-packages/click/core.py", line 956, in invoke
return ctx.invoke(self.callback, **ctx.params)
File "/usr/local/lib/python3.9/dist-packages/click/core.py", line 555, in invoke
return callback(*args, **kwargs)
File "/usr/local/lib/python3.9/dist-packages/clear/plugins/dhcp-relay.py", line 19, in dhcp6relay_clear_counters
counter = DHCPv6_Counter()
NameError: name 'DHCPv6_Counter' is not defined
- How I did it
Corrected the way to import using importlib
- How to verify it
Tested the sonic-clear command and verified no traceback is seen
#### Why I did it
**Import issue will cause:**
root@sonic:/# sudo sonic-clear arp
failed to import plugin clear.plugins.dhcprelay: No module named 'show_dhcp_relay'
#### How I did it
Fix the import.
#### How to verify it
run sudo sonic-clear arp
