Add checkbox to control if key is kept

bind8/disable_zonekey.cgi

@@ -24,7 +24,7 @@ if ($key) {
 foreach my $k (@keyfiles) {
 	&lock_file($k);
 	}
-&delete_dnssec_key($zone, 1);
+&delete_dnssec_key($zone, $in{'keep'});
 foreach my $k (@keyfiles) {
 	&unlock_file($k);
 	}

bind8/edit_zonekey.cgi

@@ -75,7 +75,8 @@ if (@keyrecs) {
 	print &ui_hr();
 	print &ui_buttons_start();
 	print &ui_buttons_row("disable_zonekey.cgi", $text{'zonekey_disable'},
-			      $text{'zonekey_disabledesc'},
+			      $text{'zonekey_disabledesc'}."<br>\n".
+			      &ui_checkbox("keep", 1, $text{'zonekey_keep'}, 1),
 			      &ui_hidden("view", $in{'view'}).
 			      &ui_hidden("zone", $in{'zone'}));
 

bind8/lang/en

@@ -1282,6 +1282,7 @@ zonekey_expandzone=Show public and private zone-key details ..
 zonekey_noprivate=However, Webmin could not find the private key associated with the zone, and so will not be able to re-sign it.
 zonekey_eprivate=The private key associated with this zone could not be read : $1
 zonekey_disable=Remove Key
+zonekey_keep=Keep existing key if DNSSEC is re-enabled?
 zonekey_disabledesc=Removes the DNSSEC key from this zone, and all signing records. Once this is done, you will be able to generate a new key.
 zonekey_sign=Sign Zone
 zonekey_signdesc=Immediately re-sign this zone, so that any changes to records made manually will be included in the signing records.