Resolve "Root issues and stage-out with SPANK"

At the end, stage-out in root installation was never implemented, so this merge request does it:

1. Stage-in (and waiting until copy happens, bool in trasfer_datasets)
2. Stage-out (and waiting until copy happens)
3. terminates adhoc fs
4. removes adhoc fs directory.

Some issues with needed environment variables solved, however LIBGKFS_HOSTS_FILE and GKFS_DAEMON and GKFS_CLIENT should be defined in the environment as they are installation dependant.

plugins/adhoc_services.d/gekkofs.sh

 #!/usr/bin/bash
 echo "GEKKOFS Script Called" $HOSTNAME $SLURM_JOBID
-
+# If GKFS_DAEMON is not defined then define it here
+if [ -z "$GKFS_DAEMON" ]; then
+    GKFS_DAEMON=/home/rnou/iodeps/bin/gkfs_daemon
+fi
+# If LIBGKFS_HOSTS_FILE is not defined then define it here
+if [ -z "$LIBGKFS_HOSTS_FILE" ]; then
+    LIBGKFS_HOSTS_FILE=/tmp/gekkofs/gkfs_hosts.txt
+fi
 
 if [ "$1" == "start" ]; then
     echo "Starting GEKKOFS"
 
     nodes=$3
     num_nodes=$(echo $nodes | awk -F, '{print NF}')
-    # If num_nodes is greater than 40, we are on the testing environment
-    if [ $num_nodes -gt 40 ]; then
+    # If num_nodes is 50, we are on the testing environment
+    if [ $num_nodes -eq 50 ]; then
         exit 0
     fi
     workdir=$5
     datadir=$7
     mountdir=$9
     unset SLURM_CPU_BIND SLURM_CPU_BIND_LIST SLURM_CPU_BIND_TYPE SLURM_CPU_BIND_VERBOSE
-    srun -N $num_nodes -n $num_nodes --oversubscribe --cpus-per-task=1 --mem-per-cpu=1 --export=ALL bash -c "mkdir -p $mountdir; mkdir -p $datadir" 
-    srun -N $num_nodes -n $num_nodes --oversubscribe --cpus-per-task=4 --mem-per-cpu=1 --export=ALL bash -c "gkfs_daemon --rootdir $datadir --mountdir $mountdir" &
+    
+    srun -N $num_nodes -n $num_nodes --oversubscribe --overlap --cpus-per-task=1 --mem-per-cpu=1 --export=ALL /usr/bin/bash -c "mkdir -p $mountdir; mkdir -p $datadir" 
+    srun -N $num_nodes -n $num_nodes --oversubscribe --overlap --cpus-per-task=1 --mem-per-cpu=1 --export=ALL /usr/bin/bash -c "$GKFS_DAEMON --rootdir $datadir --mountdir $mountdir -H $LIBGKFS_HOSTS_FILE" &
     sleep 4
 elif [ "$1" == "stop" ]; then
     echo "Stopping GEKKOFS"
     
     nodes=$3
     num_nodes=$(echo $nodes | awk -F, '{print NF}')
-    # If num_nodes is greater than 40, we are on the testing environment
-    if [ $num_nodes -gt 40 ]; then
+    # If num_nodes is 50, we are on the testing environment
+    if [ $num_nodes -eq 50 ]; then
         exit 0
     fi
     unset SLURM_CPU_BIND SLURM_CPU_BIND_LIST SLURM_CPU_BIND_TYPE SLURM_CPU_BIND_VERBOSE
-    srun -N $num_nodes -n $num_nodes --oversubscribe --cpus-per-task=1 --mem-per-cpu=1 pkill -9 gkfs_daemon
+    srun -N $num_nodes -n $num_nodes --overlap --oversubscribe --cpus-per-task=1 --mem-per-cpu=1 --export=ALL /usr/bin/bash -c "pkill -9 gkfs_daemon"
 elif [ "$1" == "expand" ]; then
     echo "Expand command"
 elif [ "$1" == "shrink" ]; then