Add env variable to configure force-systemd

[priyawadhwa]

Also add an integration test for the env variable

Rel #6404

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: priyawadhwa

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [priyawadhwa]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[minikube-pr-bot]

kvm2 Driver
docker Driver

[medyagh]

looks good to me, with required comment for integration tests failures

[priyawadhwa]

Docker_Linux

TestFunctional/parallel/ComponentHealth - 0.16s
#8014
TestFunctional/parallel/ServiceCmd - 53.31s
#8013
TestStartStop/group/containerd - 238.64s
#7704
TestStartStop/group/embed-certs - 824.01s
#7921

Hyperkit

TestFunctional/parallel/TunnelCmd
#8015

Virtualbox_Linux

TestErrorSpam
#8011

[medyagh]

@priyawadhwa

TestFunctional/parallel/ServiceCmd - 53.31s
#7765

that issue was closed this one's error is

functional_test.go:712: get failed: GET http://172.17.0.3:30602 giving up after 5 attempts
resp: <nil>

that closed issue appears to be a different error:

:Get http://127.0.0.1:10251/healthz: dial tcp 127.0.0.1:10251: connect: connection refused Error:}]}

I recommend creating a new issue for this

---

similiarly ont he component health test
there seems to be simmilar connection refused error

functional_test.go:307: unexpected status: False - item: {TypeMeta:{Kind:ComponentStatus APIVersion:v1} ObjectMeta:{Name:controller-manager GenerateName: Namespace: SelfLink:/api/v1/componentstatuses/controller-manager UID: ResourceVersion: Generation:0 CreationTimestamp:0001-01-01 00:00:00 +0000 UTC DeletionTimestamp:<nil> DeletionGracePeriodSeconds:<nil> Labels:map[] Annotations:map[]} Conditions:[{Type:Healthy Status:False Message:Get http://127.0.0.1:10252/healthz: dial tcp 127.0.0.1:10252: connect: connection refused Error:}]

[priyawadhwa]

@medyagh thanks, opened those issues and updated my comment.