BEFORE-FIX behaviour: ,/install_tests.sh always install all files from mysql-test/
AFTER-FIX behavior: ./install_tests.sh install tests just for patches listed in "series" file and from mysql-test/.
For every "name.patch" patch we have directory "mysql-test/name.patch/" with tests for this patch.
This script help to maintain patches, merge between different versions, backport patches with tests and so one.
My change fixes bug #782391
Also script print statistics of patch applying.