Pass environment needed for systemd-ask-pass #630
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systemd-ask-pass allows the pin to be provided by the systemd-credentials mechanism, but that requires the environment variable $CREDENTIALS_DIRECTORY to be set. Openvpn when launched by systemd does have this environment variable available, but it doesn't pass it through to systemd-ask-pass meaning that systemd-ask-pass is unable to load the pin from
systemd-credentials.
This change passes the $CREDENTIALS_DIRECTORY environment variable to the execed systemd-ask-pass invocation so that
systemd-credentials can be used for non-interactive pin entry.
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