sonic-net/sonic-buildimage#16466 fixing based on review comments:

To add the rdbtools into base docker.
Move saidump.sh from host to syncd docker container.

Author: JunhongMao

scripts/generate_dump

@@ -953,9 +953,9 @@ save_saidump_by_route_size() {
             echo "Dump by using Redis SAVE."
 
             if [[ ( "$NUM_ASICS" == 1 ) ]] ; then
-                save_cmd "saidump.sh" "saidump"
+                save_cmd "docker exec syncd saidump.sh" "saidump"
             else
-                save_cmd "saidump.sh $i" "saidump$i"
+                save_cmd "docker exec syncd$i saidump.sh" "saidump$i"
             fi
         else
             echo "Dump by using direct iteration of Redis DB."