Don't freak out if trying to close a socket that was already closed.

lib/roles/processor.js

@@ -97,7 +97,10 @@ module.exports = function(options) {
     .handler())
 
   lifecycle.observe(function() {
+    try {
       appDealer.close()
       devDealer.close()
+    }
+    catch (err) {}
   })
 }

lib/roles/provider.js

@@ -365,8 +365,11 @@ module.exports = function(options) {
   lifecycle.observe(function() {
     clearTimeout(totalsTimer)
 
+    try {
       push.close()
       sub.close()
+    }
+    catch (err) {}
 
     return Promise.all(Object.keys(workers).map(function(serial) {
       return workers[serial].cancel()

lib/roles/reaper.js

@@ -49,6 +49,10 @@ module.exports = function(options) {
 
   lifecycle.observe(function() {
     clearTimeout(timer)
+
+    try {
       push.close()
+    }
+    catch (err) {}
   })
 }

lib/roles/triproxy.js

@@ -34,8 +34,11 @@ module.exports = function(options) {
   log.info('PULL socket bound on', options.endpoints.pull)
 
   lifecycle.observe(function() {
+    try {
       pub.close()
       dealer.close()
       pull.close()
+    }
+    catch (err) {}
   })
 }