Remove catalogue version 5.0 from CTA and move backwards compatible changes to catalogue version 4.6

New catalogue table and respective cta-admin diskinstance and
cta-admin diskinstancespace commands

Activity Mount Rules associate a Mount Policy to an activity regex.

When recalling a file, the users can specify an activity (i.e. by using
filepath?activity=x). If specified, this activity will be used to select
a matching activity mount rule, if one exists. If more than one Activity
Mount Rule matches the activity, the one with highest retrieve priority
will be chosen.

Acitivity Mount Rules take precedence over Requester Mount Rules.

- SUPERSEDED_BY_VID removed
- SUPERSEDED_BY_FSEQ removed
- RAO associated columns removed
- ARCHIVE_FILE_RECYCLE_BIN removed
- TAPE_FILE_RECYCLE_BIN removed
- Migration scripts

CMake Warning (dev) at
/usr/share/cmake3/Modules/FindPackageHandleStandardArgs.cmake:272
(message):
  The package name passed to `find_package_handle_standard_args` (gRPC)
does
  not match the name of the calling package (GRPC).  This can lead to
  problems in calling code that expects `find_package` result variables
  (e.g., `_FOUND`) to follow a certain pattern.
Call Stack (most recent call first):
  cmake/FindGRPC.cmake:125 (FIND_PACKAGE_HANDLE_STANDARD_ARGS)
  eos_cta/CMakeLists.txt:19 (find_package)
This warning is for project developers.  Use -Wno-dev to suppress it.

[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)