Log collector automatic detection does not work for the new added kubeadm clusters

[gnuninu]

PR #211 introduced recent support for Kubeadm clusters using the switch -r kubeadm
However, automatic detection is not working at the moment because a check is missing from the sherlock function.
This is an important feature when it comes to embed the script into other collector tools like supportconfig as plugin.

Details:

wget https://raw.githubusercontent.com/rancherlabs/support-tools/master/collection/rancher/v2.x/logs-collector/rancher2_logs_collector.sh


sudo ./rancher2_logs_collector.sh 
2023-02-01 15:30:33: Created ./tmp.jchaD0DGbD
2023-02-01 15:30:33: Detecting available commands... renice ionoice
2023-02-01 15:30:33: Detecting OS... opensuse-leap 15.4
2023-02-01 15:30:33: Detecting k8s distribution... 
2023-02-01 15:30:33: couldn't detect k8s distro

It's missing this part in the sherlock function:

      if $(command -v kubeadm >/dev/null 2>&1)
        then
          if $(kubeadm version >/dev/null 2>&1)
            then
              DISTRO=kubeadm
              echo "kubeadm"
            else
              FOUND+="kubeadm"
          fi
      fi

This is harmless because kubeadm is not installed and unnecessary in Rancher clusters
I am more than happy to send a new PR to fix this