[cmake] Fixed cta/CTA#872 Fix naming convention bug in CTA/cmake/Findxrootdclient.cmake found by cmake3

the Catalogue

Deleted Schema version 1.2
Adapted tapepool management so that it works with the new VIRTUAL_ORGANIZATION table
Adapted unit tests so that a VO is created before a tapePool is created
Adapted prepare_test.sh so that it creates a VO before creating the TapePool

The insertion of the version of the Catalogue schema into the DB is now done when the schema sql files are generated. (catalogue/CMakeLists.txt)
The CTA_CATALOGUE_SCHEMA_VERSION_MAJOR and the CTA_CATALOGUE_SCHEMA_VERSION_MINOR are also inserted in version.hpp.in

Modified Findoracle-instantclient.cmake to explicitly look for libocci.so.19.1 because the oracle-instantclient19.3-devel rpm does not create the symbolic link /usr/lib/oracle/19.3/client64/lib/libocci.so

- CASTOR migration tools stay under CTA/migration
- upgrade tools are now under CTA/upgrade_db
- adds FindGRPC.cmake (required for migration tools)
- updates submodule to v0.50 (required for EOS gRPC API)

Added /usr/lib64 to the library search paths of cmake/Findmysql.cmake so that msql libraries can be found on newer linux distributions such as Fedora

Changed deafult release from 0 to 1 because 0 should never be used, see https://fedoraproject.org/wiki/Packaging:Versioning

Now the submodule does not provide a CMakeLists.txt file, this is now
provided by the main project (eos_cta/CMakeLists.txt)