refactor broker logs

broker/src/asapo_broker/database/database.go

broker/src/asapo_broker/database/mongodb.go

broker/src/asapo_broker/database/mongodb_streams.go

broker/src/asapo_broker/server/get_commands_test.go

broker/src/asapo_broker/server/get_meta_test.go

broker/src/asapo_broker/server/post_create_group.go

broker/src/asapo_broker/server/post_create_group_test.go

broker/src/asapo_broker/server/post_op_image_test.go

broker/src/asapo_broker/server/post_query_images_test.go

broker/src/asapo_broker/server/post_reset_counter_test.go

broker/src/asapo_broker/server/process_request.go

broker/src/asapo_broker/server/process_request_test.go

broker/src/asapo_broker/server/request_common.go