live: add restricted execution mode to shell/run

Try to find the script to run for a shell/run request in
/opt/opengnsys/shell/, restricted mode is enabled if the
script is found.

Excute the script without shell=True and executable=OG_SHELL in
restricted mode.

Restricted mode is a safer execution method as it only executes
code manually defined by the administrator.

Each script needs to define a shebang, this way more than just bash
is supported.

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