Stop using pip-and-virtualenv diskimage element

ALthough diskimage-builder will solve the issue eventually, but we
still prefer to put the package installation under trove's own control.

Story: 2008559
Task: 41697

Change-Id: Ie704db8233c4b797eeefa140c4a11427280dffd9

integration/scripts/files/elements/guest-agent/element-deps

@@ -3,4 +3,3 @@ package-installs
 pkg-map
 source-repositories
 svc-map
-pip-and-virtualenv

integration/scripts/files/elements/guest-agent/install.d/guest-agent-source-install/31-guest-agent-install

@@ -19,7 +19,7 @@ done
 install -D -g root -o ${GUEST_USERNAME} -m 0644 ${SCRIPTDIR}/guest-agent.logrotate /etc/logrotate.d/guest-agent
 
 # Create a virtual environment (with dependencies installed) for guest agent service
-${DIB_PYTHON} -m virtualenv ${GUEST_VENV}
+/usr/bin/python3 -m venv ${GUEST_VENV}
 ${GUEST_VENV}/bin/pip install pip --upgrade
 ${GUEST_VENV}/bin/pip install -U -c /opt/upper-constraints.txt /opt/guest-agent
 chown -R ${GUEST_USERNAME}:root ${GUEST_VENV}

integration/scripts/files/elements/guest-agent/package-installs.yaml

@@ -32,7 +32,11 @@ openssh-client:
 openssh-server:
 pollinate:
 psmisc:
+python3-dev:
+python3-pip:
+python3-setuptools:
 python3-sqlalchemy:
+python3-venv:
 rsync:
 rsyslog:
 ubuntu-cloudimage-keyring:

integration/scripts/functions_qemu

@@ -62,7 +62,6 @@ function build_guest_image() {
     export DIB_CLOUD_INIT_DATASOURCES=${DIB_CLOUD_INIT_DATASOURCES:-"ConfigDrive"}
     elementes="$elementes cloud-init-datasources"
 
-    elementes="$elementes pip-and-virtualenv"
     elementes="$elementes pip-cache"
     elementes="$elementes guest-agent"
     elementes="$elementes ${guest_os}-docker"