[do_mysql] Properly close Reader in metadata specs
[do_mysql] Properly close Reader in metadata specs

* See previous commit # cf6b18b for workaround explanation.

Signed-off-by: Alex Coles <60c6d277a8bd81de7fdde19201bf9c58a3df08f4@alexbcoles.com>

simonkro/do_mysql,simonkro/do_mysql,simonkro/do_mysql