HBASE-12969 Parameter Validation is not there for shell script, local-master-backup.sh and local-regionservers.sh

Signed-off-by: Andrew Purtell <apurtell@apache.org>

bin/local-master-backup.sh

@@ -54,5 +54,9 @@ shift;
 
 for i in $*
 do
+  if [[ "$i" =~ ^[0-9]+$ ]]; then
    run_master $cmd $i
+  else
+   echo "Invalid argument"
+  fi
 done

bin/local-regionservers.sh

@@ -52,5 +52,9 @@ shift;
 
 for i in $*
 do
+  if [[ "$i" =~ ^[0-9]+$ ]]; then
    run_regionserver $cmd $i
+  else
+   echo "Invalid argument"
+  fi
 done