ci: Drop explicit "connection:" for provisioning

This forces having to have a system libvirt instance, but that is
incompatible with running tests inside of containers/toolbox. It also
seems unnecessary: session libvirt networking and the tests work just
fine.

Drop the explicit setting and let tmt/testcloud pick its internal
default (which is `qemu:///session`). This wasn't relevant for running
on Testing Farm anyway.

Signed-off-by: Martin Pitt <mpitt@redhat.com>

Author: martinpitt

playbooks/templates/plans/test_playbooks_parallel.fmf

@@ -5,14 +5,9 @@ provision:
   # Hence there is no need to define `how` explicitly.
   - name: control-node1
     role: control_node
-    # `connection: system` is required for `how: virtual` to assign VMs a real
-    # IP making SSH configuration easier.
-    # This setting is ignored in `artemis`, so we can leave it as is.
-    connection: system
 {% for node_num in range(managed_nodes_count | int) %}
   - name: managed-node{{ node_num + 1 }}
     role: managed_node
-    connection: system
 {% if tmt_hardware is defined %}
     hardware:
 {# regex_replace is a workaround for https://github.com/yaml/pyyaml/issues/234 #}