cache-fs on NFS exceeds limits defined in binarystore.xml

Cache-fs located on an NFS will exceed the defined cache limit under load. Cache-fs needs to respect the limit regardless of where it is located.

To reproduce this issue:

• Edit binarystore.xml so the cache-fs is located on NFS
• Edit binarystore.xml cache-fs limit to 100MB
• Restart artifactory
• Perform multi-threaded upload of directory with Jfrog CLI

Cache-fs will continue to grow past the defined limit, and will continue to grow as long as uploads continue.