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PLAT-4888 - Database migration scipts fail tests

Cherry picked from aded125dd6a8c178e962cb66865451127e40b83f
also from 77e8d5923b923c69485c3f6185a8ffbcc7a470e2
PLAT-4888 - Better error message for database migration tests

cherry picked from 11f9419ab43837289a0c6e3979d8d451d91afb94
PLAT-4891 - Update reference to SQL server in maven poms

Cherry picked from e533fe607a5d796401657716c21e6bf29f9f825a
also from 7d9bb3859382c3596930fc3fa3cf782ebac9bf2c
PLAT-4916 - Fix database DDL scripts - adjust spacing

Cherry picked from 81477a5d126ac8e1c233d9ca86cc2e0ed24adb07
also from b9de439c32e781f3e1c3455e4f1ca8b2caeb05ee
PLAT-4916 - Fix database DDL scripts - add ReadMe
PLAT-4916 - Fix database DDL scripts

Cherry picked from 80de9244ae97f2db6a1cdca5dd557fe788f0b0a1
also from ecf1167b29dbaa867205eb30a01c75cf99e2557e
V_46 exg file removed
PLAT-4908 - Fix database test - CDSSwapSecurity

Caused by PLAT-4513
PLAT-4908 - Fix database test - SwapSecurity

Caused by PLAT-3995
PLAT-4932 - Fix  security master database tests in Eclipse
PLAT-4908 - SQL server database tests need access to 2 connections

Without this change, the tests hang