change the time interval used to retry rcons to more than 30 seconds

git-svn-id: https://svn.code.sf.net/p/xcat/code/xcat-core/branches/2.7@11817 8638fb3e-16cb-4fca-ae20-7b5d299a9bcd

xCAT-server/share/xcat/cons/fsp

@@ -256,7 +256,8 @@ sub invoke_cmd {
     my $power_state_cmd = "$fsp_api -a cec_state -t $type:$fsp_ip:$id:$node: 2>&1";
     my $res = xCAT::Utils->runcmd($power_state_cmd, -1);
     unless ($res and $res =~ /operating|standby/) {
-        sleep 5;
+        my $wait_interval =30+int(rand(20));
+        sleep $wait_interval;
         return("The command 'rcons' is only support while the $machine is in the '$state' state");
     }