Revert "add show dhcp_relay ipv4 counter entry, fix interface name of…

…fset issue (sonic-net#16507)"

This reverts commit 9c1c82e.

dockers/docker-dhcp-relay/cli/show/plugins/show_dhcp_relay.py

@@ -58,7 +58,7 @@ def get_interface(self):
         interfaces = []
         for key in self.db.keys(self.db.STATE_DB):
             if DHCPv4_COUNTER_TABLE in key:
-                interfaces.append(key[19:])
+                interfaces.append(key[21:])
         return interfaces
 
     def get_dhcp4relay_msg_count(self, interface, dir):
@@ -296,10 +296,6 @@ def dhcp_relay_ipv4_destination():
 def dhcp_relay_ipv6_destination():
     get_dhcp_relay(DHCP_RELAY, DHCPV6_SERVERS, with_header=True)
 
-@dhcp_relay_ipv4.command("counters")
-@click.option('-i', '--interface', required=False)
-def dhcp_relay_ip4counters(interface):
-    ipv4_counters(interface)
 
 @dhcp_relay_ipv6.command("counters")
 @click.option('-i', '--interface', required=False)