Follow up to request for test cases posted on the list.

Try to remove and add nodes in quick succession.  This currently crashes
pbs_server in v3.0.4, but not 4.0.0.

removeandaddnodes.sh:
qmgr -c "delete node compute-0-0" 2> /dev/null
qmgr -c "create node compute-0-0 np=2,ntype=cluster" 2> /dev/null
qmgr -c "delete node compute-0-1" 2> /dev/null
qmgr -c "create node compute-0-1 np=2,ntype=cluster" 2> /dev/null
qmgr -c "delete node compute-0-2" 2> /dev/null
qmgr -c "create node compute-0-2 np=2,ntype=cluster" 2> /dev/null

First run will most likely succeed, second run will result in a segfault.  This
is how the node list is refreshed in Rocks.

r.