config-daemon: fix NM udev path

[zeeke]

Function tryCreateNMUdevRule() was wrongly
concatenating path components, as path.Join(...)
removes every trailing slashes to the output string.

This regression has been introduced by

• Add unit tests for daemon package #273

Error showed up in logs with:

I1007 12:20:21.325679 10055 daemon.go:1026] tryCreateNMUdevRule()
I1007 12:20:21.325740 10055 daemon.go:1041] Old udev content '' and new content 'ACTION=="add|change|move", ATTRS

{device}=="0x1000|0x1003|0x1004|0x1014|0x1016|0x1018|0x101a|0x101c|0x101e|0x10ed|0x1515|0x154c|0x1565|0x1664|0x16c1|0x1806|0x1889|0x8090", ENV{NM_UNMANAGED}="1"
SUBSYSTEM=="net", ACTION=="add|move", ATTRS{phys_switch_id}!="", ATTR{phys_port_name}=="pf*vf*", ENV{NM_UNMANAGED}="1"' differ. Writing to file /host/etc/udev/rules.d10-nm-unmanaged.rules.
E1007 12:20:21.325772 10055 daemon.go:1048] tryCreateNMUdevRule(): failed to create dir /host/etc/udev/rules.d: mkdir /host: operation not permitted
I1007 12:20:21.325793 10055 daemon.go:294] Could not create udev rule: mkdir /host: operation not permitted

[github-actions]

Thanks for your PR,
To run vendors CIs 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 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.

[coveralls]

Pull Request Test Coverage Report for Build 3220448657

• 2 of 2 (100.0%) changed or added relevant lines in 1 file are covered.
• 4 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.3%) to 25.284%

---

Files with Coverage Reduction	New Missed Lines	%
controllers/sriovnetworkpoolconfig_controller.go	4	52.03%

Totals
Change from base Build 3218204616:	0.3%
Covered Lines:	1894
Relevant Lines:	7491

---

💛 - Coveralls

[github-actions]

Thanks for your PR,
To run vendors CIs 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 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.

[eoghanlawless]

LGTM

[cgoncalves]

LGTM