web: keep LLDP lines from piling up in the saved configuration

Save to flash merges the running log into the startup configuration.
Neither its toggle nor its overwrite rules knew "lldp on|off", so every
switch of LLDP added another line: four switches left four lines.
"port <n> lldp permit|block" fell under the rule for "port <n> <speed>",
so setting a port's speed dropped its LLDP setting from the saved
configuration, and the other way round.

"lldp on|off" is now a toggle, and a per-port LLDP setting replaces only
an earlier per-port LLDP setting of that port.

html/app.js

@@ -2264,14 +2264,14 @@ var CONF_OVERWRITE=[
   /^ntp\s+server\b/,/^ntp\s+interval\b/,/^ntp\s+timezone\b/,/^ntp\s+dst\b/,
   /^vlan\s+\d{1,4}\s+mgmt$/,/^vlan\s+\d{1,4}(?!\s+mgmt\b)/,
   /^pvid\s+\d{1,2}\b/,
-  /^port\s+\d{1,2}(?!\s+name\b)/,/^port\s+\d{1,2}\s+name\b/,
+  /^port\s+\d{1,2}(?!\s+(name|lldp)\b)/,/^port\s+\d{1,2}\s+name\b/,
   /^mirror\b/,
   /^lag\s+\d\b/,/^laghash\s+\d\b/,/^isolate\s+\d{1,2}\b/,
   /^stp\s+(prio|hello|maxage|fwd|txhold|version)\b/,
   /^stp\s+(port\s+\d{1,2}|lag\s+[1-4])\s+(edge|cost|prio|guard|filter|p2p)\b/,
   /^igmp\b/,/^mtu\s+\d{1,2}\b/,/^storm\s+\d{1,2}\s+(bcast|mcast|ucast|umcast)\b/,
 ];
-var CONF_TOGGLE=[/^(syslog)\s+(on|off)$/,/^(ntp)\s+(on|off)$/,/^(stp)\s+(on|off)$/,/^(stp\s+(port\s+\d{1,2}|lag\s+[1-4]))\s+(on|off)$/];
+var CONF_TOGGLE=[/^(syslog)\s+(on|off)$/,/^(ntp)\s+(on|off)$/,/^(stp)\s+(on|off)$/,/^(lldp)\s+(on|off)$/,/^(stp\s+(port\s+\d{1,2}|lag\s+[1-4]))\s+(on|off)$/];
 function mergeConf(base,texts){
   var conf=base.slice();
   function drop(rx){conf=conf.filter(function(c){return!rx.test(c)})}
@@ -2289,6 +2289,7 @@ function mergeConf(base,texts){
       }
       if((m=line.match(/^lag (\d) lacp off$/))){drop(new RegExp("^lag "+m[1]+" lacp( |$)"));return;}
       if(line==="mirror off"){drop(/^mirror /);return;}
+      if((m=line.match(/^(port \d{1,2} lldp) (permit|block)$/))){drop(new RegExp("^"+m[1]+" (permit|block)$"));conf.push(line);return;}
       if(!isConfCmd(line))return;
       if((m=line.match(/^ingress (.+)$/))){
         if(/^[tua]$/.test(m[1])){drop(/^ingress /);conf.push(line);return;}
@@ -2321,7 +2322,7 @@ function mergeConf(base,texts){
           var key=line.match(rx)[0];
           conf=conf.filter(function(item){
             return!(item===key||(item.indexOf(key+" ")===0
-              &&!/\smgmt$/.test(item)&&item.indexOf(key+" name ")!==0));
+              &&!/\smgmt$/.test(item)&&item.indexOf(key+" name ")!==0&&item.indexOf(key+" lldp ")!==0));
           });
           break;
         }