fix(snap): Refactor to avoid conflicts with readonly config provider directory

[MonicaisHer]

This PR makes changes to incorporate the following fixes:

• Move env file to parent directory to avoid conflict with config provider canonical/edgex-snap-hooks#83
• Add snapctl wrapper to check connected interfaces canonical/edgex-snap-hooks#82

Additionally, the following changes have been made:

• remove deprecated startup-duration and startup-interval options

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Testing Instructions

For testing instructions, please refer to edgexfoundry/device-mqtt-go#535

New Dependency Instructions (If applicable)