Fixed package name in dockerfile

templates/tools/dockerfile/test/node_jessie_x64/Dockerfile.template

@@ -35,7 +35,7 @@
 
   # Install Electron apt dependencies
   RUN apt-get update && apt-get install -y ${'\\'}
-    libasound ${'\\'}
+    libasound2 ${'\\'}
     libgconf-2-4 ${'\\'}
     libgtk2.0-0 ${'\\'}
     libnss3 ${'\\'}

tools/dockerfile/test/node_jessie_x64/Dockerfile

@@ -66,7 +66,7 @@ RUN apt-get update && apt-get install -y time && apt-get clean
 
 # Install Electron apt dependencies
 RUN apt-get update && apt-get install -y \
-  libasound \
+  libasound2 \
   libgconf-2-4 \
   libgtk2.0-0 \
   libnss3 \