Improve performance of querying instance configs when new participant joins cluster

[GrantPSpencer]

Is your feature request related to a problem? Please describe.
N/A

Describe the solution you'd like
findInstancesWithMatchingLogicalId should perform work in parallel or leverage a method of the base dataAccessor such as getChildValues which performs async get operations.

We should also investigate if there are other areas in the code that make sequential calls to ZK that can be improved.