Unable to select dl0.0 interface [LTE] as external interface in VPN.

When creating vpn in SDC, the user is unable to select the LTE interface as the external interface. This interface is not populated under VPN, but the interface is populated under device page.

• This feature is not suported in current release of SD-Cloud. An internal jira is in place to add this feature in future release.
• Jira (SB-15178) - Unable to select dl0.0 interface as external interface in VPN.