Add Cloud Provider Secrets Check

[tpoland]

The Blacksmith kit does not currently prompted for Cloud Provider secrets when doing a secret-check.

STDOUT:
5 error(s) detected:
 - $.instance_groups.blacksmith.properties.azure.client_id: secret /secret/db/eastus/dev/blacksmith/azure:client_id not found
 - $.instance_groups.blacksmith.properties.azure.client_secret: secret /secret/db/eastus/dev/blacksmith/azure:client_secret not found
 - $.instance_groups.blacksmith.properties.azure.ssh_public_key: secret /secret/db/eastus/dev/blacksmith/azure/ssh:public not found
 - $.instance_groups.blacksmith.properties.azure.subscription_id: secret /secret/db/eastus/dev/blacksmith/azure:subscription_id not found
 - $.instance_groups.blacksmith.properties.azure.tenant_id: secret /secret/db/eastus/dev/blacksmith/azure:tenant_id not found
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