* Update turnkey.sh
Allow choosing container ID & add tun device access to the container. Also notify user that the credentials are stored in a file on the host machine.
* Update turnkey.sh
fixed how tun access is added by instead modifying the conf file of the container. Also added filtering to only add tun access if required. A few other minor verbiage changes/corrections.
* Update turnkey.sh
Corrected variable expansion.
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