Merge branch 'get_available' into 'develop'

broker/src/asapo_broker/database/database.go

broker/src/asapo_broker/database/mongodb.go

broker/src/asapo_broker/server/get_commands_test.go

broker/src/asapo_broker/server/get_id.go

broker/src/asapo_broker/server/get_next.go

broker/src/asapo_broker/server/process_request_test.go

common/cpp/include/asapo/common/data_structs.h

common/cpp/src/data_structs/data_structs.cpp

common/cpp/src/database/mongodb_client.cpp

common/cpp/src/database/mongodb_client.h

common/cpp/unittests/data_structs/test_data_structs.cpp

consumer/api/cpp/include/asapo/consumer/consumer.h

consumer/api/cpp/src/consumer_impl.cpp

consumer/api/cpp/src/consumer_impl.h

consumer/api/cpp/unittests/test_consumer_impl.cpp

consumer/api/python/asapo_consumer.pxd

consumer/api/python/asapo_consumer.pyx.in

consumer/tools/folder_to_db/src/folder_db_importer.cpp

examples/consumer/getnext_python/check_linux.sh

examples/consumer/getnext_python/getnext.py