Fix and update the vagrant build system

Fix a dependency issue for the vagrant build system and update
it to the latest Ubuntu LTS release (16.04 LTS). Also give it
more vCPU's and RAM by default.

Change-Id: I058e6a05356dba57a55ada7fe84f959e227a04b4
Reviewed-on: https://code.wireshark.org/review/26541
Reviewed-by: Sake Blok <sake.blok@SYN-bit.nl>

Vagrantfile

@@ -6,13 +6,13 @@ VAGRANTFILE_API_VERSION = "2"
 
 Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
 
-  # Base box is Ubuntu 14.04
-  config.vm.box = "ubuntu/trusty64"
+  # Base box is Ubuntu 16.04
+  config.vm.box = "ubuntu/xenial64"
 
   # Bump the default resources as building is expensive
   config.vm.provider "virtualbox" do |v|
-    v.memory = 1024
-    v.cpus = 2
+    v.memory = 2048
+    v.cpus = 4
   end
 
   # Permit X11 forwarding so running the graphical Wireshark works

vagrant_build.sh

@@ -15,4 +15,4 @@ grep -q WIRESHARK_BIN_DIR ~/.profile || echo "export WIRESHARK_BIN_DIR=~/build/r
 mkdir -p build
 cd build
 cmake /vagrant/
-make -j3
+make -j6

vagrant_provision.sh

@@ -12,6 +12,6 @@ set -e
 
 apt-get update
 apt-get build-dep -y wireshark
-apt-get install -y cmake valgrind qt5-default \
+apt-get install -y git cmake valgrind qt5-default \
     libqt5multimedia5 qtmultimedia5-dev \
-    qttools5-dev qttools5-dev-tools
+    libqt5svg5-dev qttools5-dev qttools5-dev-tools