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- Add 'libboost-all-dev' and 'libreadline-gplv2-dev' as they were was found
  to be a compulsory build dependency for columnstore plugin.
- Add 'expect' as run-time dependencey for columnstore plugin as scripts
  use it:
    usr/bin/mcs_module_installer.sh: #!/usr/bin/expect
    usr/bin/remote_command.sh: #!/usr/bin/expect
    usr/bin/remote_command_verify.sh: #!/usr/bin/expect
    usr/bin/remote_scp_get.sh: #!/usr/bin/expect
    usr/bin/remote_scp_put.sh: #!/usr/bin/expect
    usr/bin/rsync.sh: #!/usr/bin/expect
- Properly define depends on Python. No Python 2 support needs to be
  considered, Python 3 has been around long enough. Fixes Lintian errors
    E: mariadb-plugin-columnstore: python-script-but-no-python-dep
    usr/bin/mcs-loadbrm.py #!python
    E: mariadb-plugin-columnstore: python-script-but-no-python-dep
    usr/bin/mcs-start-storagemanager.py #!python
- Partially revert undocumented and thus unjustified changes in commits
  d69a79da632870...