added gNMISubscitptions.txt into gosdnc container

Katharina Renkrequested to merge
fix-gnmi-subscription-path into master

Description

Following error occured:

Error reading in gNMI subscription paths, can not watch network elements automatically: open controller/configs/gNMISubscriptions.txt: no such file or directory.

This is now fixed by copying the gNMISubscriptions.txt file into the gosdn-controller container and modifying the path containerlab-gosdn.toml.example, so that it matches.

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