[19.03 backport] Fix advanced options for backward compatibility #1967
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backport of #1963 for 19.03
For backward compatibility: if no custom options are provided for the network,
and only a single network is specified, omit the endpoint-configuration
on the client (the daemon will still create it when creating the container)
This fixes an issue on older versions of legacy Swarm, which did not support
NetworkingConfig.EndpointConfig.This was introduced in 5bc0963 (#1767)
fixes #1854