d/t/pacemaker-node-status.sh: Use "uname -n" instead of "node1" as the node name

Lucas Kanashirorequested to merge
kanashiro/crmsh:autopkgtest-use-uname-to-define-node-name into master

This change will be needed in case this corosync MR is accepted:

corosync!4 (closed)

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