keymgr: add 'zone key ds' into completion

samples/keymgr-completion.sh

@@ -156,7 +156,7 @@ _keymgr()
 								COMPREPLY=( $( compgen -W "$c" -- "$cur" ) )
 							fi
 							;;
-						show)
+						show|ds)
 							count=$((count + 1))
 							if [[ $count -ne $cword ]]; then
 								local c=$( keymgr zone key list "$sub3cmd" 2>/dev/null | cut -f 2 -d ' ' )
@@ -168,7 +168,7 @@ _keymgr()
 							;;
 						*)
 							COMPREPLY=( $( compgen -W 'generate import
-						        list set show' -- "$cur" ) )
+						        list set show ds' -- "$cur" ) )
 							;;
 					esac
 					;;

samples/keymgr-completion.zsh

@@ -75,6 +75,7 @@ _regex_words zone-key-commands "zone key commands" \
 	'i*mport:import keys from file:$zone_key_import_cmds' \
 	'l*ist:list keys:$zones' \
 	'sh*ow:show a key:$zones' \
+	'd*s:show DS records for a key:$zones' \
 	'se*t:set attributes of a key:$zone_key_set_cmds'
 zone_key_cmds=("$reply[@]")