revert id === null logic as it causes timeouts with bootstrap nodes

lib/io.js

@@ -219,19 +219,6 @@ class IO {
   }
 
   response (request, value, closerNodes, peer) {
-    if (this._ctx.ephemeral) {
-      const privateCommand = request.command.charCodeAt(0) === 95 // '_'
-      if (privateCommand === false) {
-        // if a node was non-ephemeral and then was
-        // set to ephemeral, other DHT nodes will
-        // still have a reference to the node. Therefore
-        // if the node is ephemeral and the request
-        // is not a DHT internals command ignore the
-        // request to make other nodes remove it from
-        // their list.
-        return
-      }
-    }
     const message = {
       type: TYPE.RESPONSE,
       rid: request.rid,

lib/query-stream.js

@@ -95,11 +95,6 @@ class QueryStream extends Readable {
       return
     }
 
-    if (message.id === null) {
-      this._readMaybe()
-      return
-    }
-
     const value = this._outputEncoding
       ? this._decodeOutput(message.value)
       : message.value

test.js

@@ -246,46 +246,6 @@ tape('setEphemeral(false)', function (t) {
   })
 })
 
-tape('setEphemeral(true)', function (t) {
-  bootstrap(function (port, node) {
-    const a = dht({ bootstrap: port, ephemeral: false })
-    const b = dht({ bootstrap: port })
-
-    a.command('hello', {
-      query (data, callback) {
-        callback(null, Buffer.from('world'))
-      }
-    })
-
-    a.ready(function () {
-      b.ready(function () {
-        const key = blake2b(Buffer.from('hello'))
-        b.query('hello', key, (err, result) => {
-          t.error(err)
-          t.is(result.length, 1)
-          t.is(Buffer.compare(result[0].node.id, a.id), 0)
-          a.setEphemeral(true, (err) => {
-            t.error(err)
-            b.query('hello', key, (err, result) => {
-              t.ok(err)
-            })
-            b.once('remove-node', () => {
-              b.query('hello', key, (err, result) => {
-                t.error(err)
-                t.is(result.length, 0)
-                a.destroy()
-                b.destroy()
-                node.destroy()
-                t.end()
-              })
-            })
-          })
-        })
-      })
-    })
-  })
-})
-
 function bootstrap (done) {
   const node = dht({
     ephemeral: true