This change makes the etcd package compatible with the existing Go
ecosystem for module versioning.
Used this tool to update package imports:
https://github.com/KSubedi/gomove
Connection pausing added another exit condition in the listener
path, causing the bridge to leak connections instead of closing
them when signalled to close. Also adds some additional Close
paranoia.
Fixes#7823
Tests need to disconnect the network connection for the client to check
reconnection paths but closing a grpc connection closes the logical connection.
To disconnect the client, instead have a bridge between the server and
the client which can monitor and reset connections.
