[BIS-300] Add database connection logging to AS and fix / improve script for DSS.

datastore_server/dist/datastore_server.sh

openbis/dist/admin/list-postgres-queries.sh

openbis/dist/server/debug-db-connections.sh

openbis/dist/server/log-db-connections.sh

openbis/dist/server/log-thread-dump.sh

openbis/dist/server/record-stacktrace-db-connections.sh

openbis/dist/server/setup-env

openbis/dist/server/status.sh