ETP Server goes into Crash-Backoff Loop if ANY partition has a property value that is not a string

The ETP Server can go into a crash-backoff loop on deployment/re-deployment if any partition has any property whose value that is not a string.

This is possible to achieve if a partition has it's corresponding value set to a null value, or if the partition has any property with a numeric value.

For example, creating a partition with the following value will cause a crash-backoff loop when the ETP Server restarts:

{
    "properties": {
        "nullValue": { "value": null }
    }
}

Even if this was not explicitly allowed by the Partition service (according to the swagger docs, a partition's property can be any value, and does not need to be a string), this should still need to be addressed.