Move logs under artifacts

[kishen-v]

Fixes:

1. Empty log file for respective components.
2. Creating directory under _artifacts for avoiding uploading the _rundir

I1107 00:41:55.457106  200060 dumplogs.go:45] About to run: [kubectl cluster-info dump]
I1107 00:42:00.025368  200060 dumplogs.go:64] Collecting node level information from PowerVS instance 150.240.145.228
I1107 00:42:00.025425  200060 dumplogs.go:75] Remotely executing command: [ssh -i /root/.ssh/kishen [email protected] dmesg]
I1107 00:42:01.277571  200060 dumplogs.go:75] Remotely executing command: [ssh -i /root/.ssh/kishen [email protected] sudo journalctl --no-pager --output=short-precise -k]
I1107 00:42:02.286427  200060 dumplogs.go:75] Remotely executing command: [ssh -i /root/.ssh/kishen [email protected] sudo systemctl list-units -t service --no-pager --no-legend --all]
I1107 00:42:03.196091  200060 dumplogs.go:75] Remotely executing command: [ssh -i /root/.ssh/kishen [email protected] journalctl -xeu containerd --no-pager]
I1107 00:42:04.202346  200060 dumplogs.go:64] Collecting node level information from PowerVS instance 150.240.145.227
I1107 00:42:04.202392  200060 dumplogs.go:75] Remotely executing command: [ssh -i /root/.ssh/kishen [email protected] dmesg]
I1107 00:42:05.485518  200060 dumplogs.go:75] Remotely executing command: [ssh -i /root/.ssh/kishen [email protected] sudo journalctl --no-pager --output=short-precise -k]
I1107 00:42:06.504498  200060 dumplogs.go:75] Remotely executing command: [ssh -i /root/.ssh/kishen [email protected] sudo systemctl list-units -t service --no-pager --no-legend --all]
I1107 00:42:07.444307  200060 dumplogs.go:75] Remotely executing command: [ssh -i /root/.ssh/kishen [email protected] journalctl -xeu containerd --no-pager]
I1107 00:42:08.499815  200060 dumplogs.go:98] Successfully collected cluster logs under /root/kubetest2-plugins/_artifacts/logs

Relevant logs with non-0 byte content

[root@kubetest21 logs]# ls -ltra
total 1280
drwxr-xr-x 3 root root     63 Nov  7 00:41 ..
-rw-r--r-- 1 root root 800641 Nov  7 00:42 cluster-info.log
-rw-r--r-- 1 root root  49398 Nov  7 00:42 150.240.145.228-dmesg.log
-rw-r--r-- 1 root root  67475 Nov  7 00:42 150.240.145.228-kernel.log
-rw-r--r-- 1 root root  12292 Nov  7 00:42 150.240.145.228-services.log
-rw-r--r-- 1 root root  70317 Nov  7 00:42 150.240.145.228-containerd.log
-rw-r--r-- 1 root root  49409 Nov  7 00:42 150.240.145.227-dmesg.log
-rw-r--r-- 1 root root  67562 Nov  7 00:42 150.240.145.227-kernel.log
-rw-r--r-- 1 root root  12292 Nov  7 00:42 150.240.145.227-services.log
-rw-r--r-- 1 root root 149452 Nov  7 00:42 150.240.145.227-containerd.log
drwxr-xr-x 2 root root   4096 Nov  7 00:42 .

Post merge - The following PR can be merged.
ppc64le-cloud/test-infra#498

[mkumatag]

/lgtm

[ppc64le-cloud-bot]

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