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Allows us to perform multiple operations with a single request
under the same transaction.

For certain cases where we can not afford to have query params
like OAuth, sink signature can be placed at the end of the sink path

This reverts commit 959e2742.

This issue was resolved inside corteza-js
https://github.com/cortezaproject/corteza-js/pull/10

If needed, sufficiant logging can be achieved with enviromental variables:
GRPC_GO_LOG_VERBOSITY_LEVEL=99 #
GRPC_GO_LOG_SEVERITY_LEVEL=info # (error, warning, info, fatal)