`dump-tables` and `load-tables` `--tables` flag does not work

[vjeeva]

When running either of those commands with the --tables flag, the tables get passed into the function as a list of strings (as per the function signature), but the code was previously written with the tables being passed as a comma separated list.

Please update those functions to support the list of strings when --tables is specified at the command-line.

[vjeeva]

Also test if those commands even work... If not, get rid of them. If yes, include them in our integration testing.