Fixed Issues in Cloud Connectors

Review the list of Cloud Connectors issues that are resolved in Cloudera Runtime 7.2.8.

CDPD-18287: Significant thread contention while initialising AzureBlobFileSystem.

Reduced the thread contention while initializing filesystems, especially AzureBlobFileSystem or other object stores. The number of filesystems that can be created in parallel is now limited in the option fs.creation.parallel.count, default value 64. A smaller value improves the worker thread startup time in processes, especially when many worker threads are attempting to interact with the same object stores. This issue is now resolved.