db: re-order tests

1. move test files from packaging to test so that these will not be
   installed at target system.

2. move duplicate scripts test from maven to Makefile.

3. remove schema checksum test from maven, it seems that it is not used
   and parameters are out of date, manual invocation is still possible,
   however these tests were not added to Makefile.

Change-Id: Icfb36b8cd75ac357378a67b2701eb9002da988e3
Signed-off-by: Alon Bar-Lev <alonbl@redhat.com>