dhcp: T7052: Clean up unnecessary params in formatter methods

The formatter methods are mostly `family` agnostic now.

src/op_mode/dhcp.py

@@ -204,7 +204,7 @@ def _get_raw_server_pool_statistics(config, family='inet', pool=None):
     return stats
 
 
-def _get_formatted_server_pool_statistics(pool_data, family='inet'):
+def _get_formatted_server_pool_statistics(pool_data):
     data_entries = []
     for entry in pool_data:
         pool = entry.get('pool')
@@ -234,7 +234,7 @@ def _get_raw_server_static_mappings(config, family='inet', pool=None, sorted=Non
     return mappings
 
 
-def _get_formatted_server_static_mappings(raw_data, family='inet'):
+def _get_formatted_server_static_mappings(raw_data):
     data_entries = []
 
     for entry in raw_data:
@@ -481,7 +481,7 @@ def _get_raw_client_leases(family='inet', interface=None):
     return lease_data
 
 
-def _get_formatted_client_leases(lease_data, family):
+def _get_formatted_client_leases(lease_data):
     from time import localtime
     from time import strftime