refactor: Consume Provision Watcher changes for running multiple instances

[lenny-goodell]

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PR Checklist

Please check if your PR fulfills the following requirements:

• I am not introducing a breaking change (if you are, flag in conventional commit message with BREAKING CHANGE: describing the break)
• I am not introducing a new dependency (add notes below if you are)
• I have added unit tests for the new feature or bug fix (if not, why?) N/A
• I have fully tested (add details below) this the new feature or bug fix (if not, why?)
• I have opened a PR for the related docs change (if not, why?) N/A

Testing Instructions

Run non-secure EdgeX Stack
Build service from this PR branch
run service with -cp -d -o flags
Verify service starts w/o errors and logs have the following

msg="ProvisionWatcher Generic-Onvif-Provision-Watcher not found in Metadata, adding it..."
"provision watcher Generic-Onvif-Provision-Watcher added"

Restart the service with the -cp -d -o -i 1 flags
Verify service starts w/o errors and logs have the following

"ProvisionWatcher Generic-Onvif-Provision-Watcher exists, using the existing one"

New Dependency Instructions (If applicable)