use 'bws-' prefix to match style of bwc clientVersion values

lib/server.js

@@ -50,7 +50,7 @@ function WalletService() {
   this.blockchainExplorerOpts = blockchainExplorerOpts;
   this.messageBroker = messageBroker;
   this.notifyTicker = 0;
-  this.serverVersion = Package.version;
+  this.serverVersion = 'bws-' + Package.version;
 };
 
 

test/integration/server.js

@@ -756,7 +756,7 @@ describe('Wallet service', function() {
         clientVersion: 'bwc-0.0.1',
       });
       server.clientVersion.should.equal('bwc-0.0.1');
-      should.exist(server.serverVersion);
+      server.serverVersion.indexOf('bws-').should.equal(0);
     });
   });