Add a parameter to configure the number of FSTs to run ( default is 6)

added a parameter to start_services.sh ( -n ) to configure the number of FSTs to run and to shutdown_services.sh to remove them accordingly. Modified also the internal script eos_mgm_fs_setup.sh to use this new parameter.

image_scripts/eos_mgm_fs_setup.sh

 #!/usr/bin/env bash
 
+n_fst=6
+
+if [ $# -ne 0 ]
+  then
+    n_fst=$1
+fi
+
+
 # Enable default space with quota disabled
 eos -b space set default on
 eos -b space quota default off
@@ -7,7 +15,7 @@ eos -b space quota default off
 echo "Wait for FSTs to become online ..."
 
 for i in `seq 1 30`; do
-  if [ `eos fs ls | grep online | wc -l` -eq 6 ]; then
+  if [ `eos fs ls | grep online | wc -l` -eq $n_fst ]; then
       echo "All FSTs are online"
       break
   else
@@ -15,7 +23,7 @@ for i in `seq 1 30`; do
   fi
 done
 
-if [ `eos fs ls | grep online | wc -l` -ne 6 ]; then
+if [ `eos fs ls | grep online | wc -l` -ne $n_fst ]; then
     echo "Some of the FSTs are not online ... aborting!"
     eos fs ls
     exit 1;
@@ -27,7 +35,7 @@ eos -b config save -f default
 echo "Wait for FSTs to boot ..."
 
 for i in `seq 1 30`; do
-  if [ `eos fs ls | grep booted | wc -l` -eq 6 ]; then
+  if [ `eos fs ls | grep booted | wc -l` -eq $n_fst ]; then
     echo "All FSTs are booted"
     break
   else
@@ -35,7 +43,7 @@ for i in `seq 1 30`; do
   fi
 done
 
-if [ `eos fs ls | grep booted | wc -l` -ne 6 ]; then
+if [ `eos fs ls | grep booted | wc -l` -ne $n_fst ]; then
     echo "Some of the FSTs are not booted ... aborting!"
     eos fs ls
     exit 1;