dracut-module-setup: allow short hostname in cluster configuration

Node could be referenced by short hostname (hostname -s) in cluster
configuration:

[root@virt-068 /]# pcs status nodes
Pacemaker Nodes:
 Online: virt-066 virt-067 virt-068
 Standby:
 Offline:

We didn't know it before. Martin noticed the kdump failure, and provide
this fix. Thanks to Martin.

Signed-off-by: WANG Chao <chaowang@redhat.com>
Tested-by: Martin Juricek <mjuricek@redhat.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>

dracut-module-setup.sh

@@ -502,7 +502,7 @@ get_pcs_fence_kdump_nodes() {
         eval $node
         nodename=$uname
         # Skip its own node name
-        if [ "$nodename" = `hostname` ]; then
+        if [ "$nodename" = `hostname` -o "$nodename" = `hostname -s` ]; then
             continue
         fi
         nodes="$nodes $nodename"