Testsuite: Move needed packages to Dockerfile insted of in the Jenkins pipeline

Jenkinsfile

@@ -120,7 +120,6 @@ pipeline {
         stage('Test') {
             steps {
                 sh """
-                    sudo apt-get update && sudo apt-get install -y python3-pexpect qemu-kvm 
                     cd build/ 
                     sudo ../scripts/check-qemu-install --debug live-image-amd64.hybrid.iso
                 """

docker/Dockerfile

@@ -280,6 +280,11 @@ RUN apt-get update && apt-get install -y \
       python2.7-dev \
       libmariadb-dev
 
+# Packages needed for Qemu test-suite
+RUN apt-get update && apt-get install -y \
+      python3-pexpect \
+      qemu-kvm
+
 # Install packer
 RUN export LATEST="$(curl -s https://checkpoint-api.hashicorp.com/v1/check/packer | \
     jq -r -M '.current_version')"; \