Merge ~pwlars/snappy-hwe-snaps/+git/jenkins-jobs:prepare-with-virtualenv into ~snappy-hwe-team/snappy-hwe-snaps/+git/jenkins-jobs:master

[Paul Larson]

Add virtualenv to prepare-0-install.sh for the cert jobs we're looking to add

[System Enablement Bot (system-enablement-ci-bot)]

PASSED: Continuous integration, rev:1119ddbbeee9a18bd5f5f48b54d8b4fb29320201
https://jenkins.canonical.com/system-enablement/job/generic-build-snap/1833/
Executed test runs:
    SUCCESS: https://jenkins.canonical.com/system-enablement/job/generic-build-snap-worker/2755
    None: https://jenkins.canonical.com/system-enablement/job/generic-update-snap-mp/1741/console
    SUCCESS: https://jenkins.canonical.com/system-enablement/job/generic-test-snap/3044

Click here to trigger a rebuild:
https://jenkins.canonical.com/system-enablement/job/generic-build-snap/1833/rebuild

review: Approve (continuous-integration)

[Konrad Zapałowicz (kzapalowicz)]

ack

review: Approve (code)

[Simon Fels (morphis)]

LGTM

review: Approve

diff --git a/jobs/infrastructure/prepare-0-install.sh b/jobs/infrastructure/prepare-0-install.sh
index 9fae262..032acb7 100644
--- a/jobs/infrastructure/prepare-0-install.sh
+++ b/jobs/infrastructure/prepare-0-install.sh
@@ -40,6 +40,7 @@ sudo apt-get install --yes \
     qemu \
     binfmt-support \
     qemu-user-static \
+    virtualenv \
     {install_packages}
 
 # Install jenkins-jobs-builder