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

[farshidtz]

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

Signed-off-by: Farshid Tavakolizadeh [email protected]

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[MonicaisHer]

@farshidtz Thank you, looks good.