Clean Systemd files on exit

[souleb]

We have run into an issue where removing the operator leaves behind the systemd files.

If implemented all systemD related files will be cleaned up on exit on non openshift distributions.

[github-actions[bot]]

Thanks for your PR, To run vendors CIs, Maintainers can use one of:

• /test-all: To run all tests for all vendors.
• /test-e2e-all: To run all E2E tests for all vendors.

• /test-e2e-nvidia-all: To run all E2E tests for NVIDIA vendor.

  To skip the vendors CIs, Maintainers can use one of:

• /skip-all: To skip all tests for all vendors.
• /skip-e2e-all: To skip all E2E tests for all vendors.
• /skip-e2e-nvidia-all: To skip all E2E tests for NVIDIA vendor. Best regards.

[souleb]

cc @e0ne

[coveralls]

Pull Request Test Coverage Report for Build 11341895365

Details

• 10 of 52 (19.23%) changed or added relevant lines in 2 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.05%) to 44.967%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/daemon/daemon.go	10	15	66.67%
cmd/sriov-network-config-daemon/start.go	0	37	0.0%
<!--	Total:	10	52	19.23%	-->

Files with Coverage Reduction	New Missed Lines	%
controllers/drain_controller.go	1	68.06%
<!--	Total:	1		-->

Totals
Change from base Build 11294509064:	-0.05%
Covered Lines:	6669
Relevant Lines:	14831

---

💛 - Coveralls