purge-cluster: fix grep match for NVMe and HP Smart Array devices

raw_device would return invalid block device names for NVMe and HPSA
devices which would cause sgdisk partition deletion to fail

$ echo /dev/nvme1n1p3 | egrep -o '/dev/([hsv]d[a-z]{1,2}|cciss/c[0-9]d[0-9]p|nvme[0-9]n[0-9]p){1,2}'
/dev/nvme1n1p

$ echo /dev/cciss/c0d0p2 |  egrep -o '/dev/([hsv]d[a-z]{1,2}|cciss/c[0-9]d[0-9]p|nvme[0-9]n[0-9]p){1,2}'
/dev/cciss/c0d0p

infrastructure-playbooks/purge-cluster.yml

@@ -331,7 +331,7 @@
         echo "Do not use your system disk!"
         exit 1
       fi
-      raw_device=$(echo "{{ item }}" | egrep -o '/dev/([hsv]d[a-z]{1,2}|cciss/c[0-9]d[0-9]p|nvme[0-9]n[0-9]p){1,2}')
+      raw_device=$(echo "{{ item }}" | egrep -o '/dev/([hsv]d[a-z]{1,2}|cciss/c[0-9]d[0-9]|nvme[0-9]n[0-9]){1,2}')
       partition_nb=$(echo "{{ item }}" | egrep -o '[0-9]{1,2}$')
       sgdisk --delete $partition_nb $raw_device
     with_items: "{{ ceph_journal_partition_to_erase_path.stdout_lines | default([]) }}"