little fixes

lib/cmds/blockchain/blockchain.js

@@ -124,33 +124,28 @@ Blockchain.prototype.run = function() {
 
     child.on('error', (err) => {
       err = err.toString();
-      console.error('ERROR', err);
+      console.error('Blockchain error: ', err);
       if (self.env === 'development' && err.indexOf('Failed to unlock') > 0) {
         console.error('\n' + __('Development blockchain has changed to use the --dev option.').yellow);
         console.error(__('You can reset your workspace to fix the problem with').yellow + ' embark reset'.cyan);
         console.error(__('Otherwise, you can change your data directory in blockchain.json (datadir)').yellow);
       }
     });
-    // Geth logs appear in stderr somehow
-    let lastMessage;
     child.stdout.on('data', (data) => {
       console.log(`Geth error: ${data}`);
     });
+    // Geth logs appear in stderr somehow
     child.stderr.on('data', (data) => {
       data = data.toString();
       if (self.onReadyCallback && !self.readyCalled && data.indexOf('Mapped network port') > -1) {
         self.readyCalled = true;
         self.onReadyCallback();
       }
-      lastMessage = data;
       console.log('Geth: ' + data);
     });
     child.on('exit', (code) => {
       if (code) {
         console.error('Geth exited with error code ' + code);
-        if (lastMessage) {
-          console.error(lastMessage);
-        }
       }
     });
   });

lib/processes/storageProcesses/ipfs.js

@@ -32,7 +32,6 @@ class IPFSProcess extends ProcessWrapper {
   startIPFSDaemon() {
     const self = this;
     const child = child_process.spawn('ipfs', ['daemon']);
-    let lastMessage;
 
     child.on('error', (err) => {
       err = err.toString();
@@ -48,15 +47,11 @@ class IPFSProcess extends ProcessWrapper {
         self.readyCalled = true;
         self.send({result: constants.storage.initiated});
       }
-      lastMessage = data;
       console.log('IPFS: ' + data);
     });
     child.on('exit', (code) => {
       if (code) {
         console.error('IPFS exited with error code ' + code);
-        if (lastMessage) {
-          console.error(lastMessage);
-        }
       }
     });
   }

lib/processes/storageProcesses/swarm.js

@@ -34,27 +34,22 @@ class SwarmProcess extends ProcessWrapper {
       err = err.toString();
       console.error('Swarm error: ', err);
     });
-    let lastMessage;
     child.stdout.on('data', (data) => {
       data = data.toString();
       console.log(`Swarm error: ${data}`);
     });
-    // Geth logs appear in stderr somehow
+    // Swarm logs appear in stderr somehow
     child.stderr.on('data', (data) => {
       data = data.toString();
       if (!self.readyCalled && data.indexOf('Swarm http proxy started') > -1) {
         self.readyCalled = true;
         self.send({result: constants.storage.initiated});
       }
-      lastMessage = data;
       console.log('Swarm: ' + data);
     });
     child.on('exit', (code) => {
       if (code) {
         console.error('Swarm exited with error code ' + code);
-        if (lastMessage) {
-          console.error(lastMessage);
-        }
       }
     });
   }