Partition name limitation for disk usage alerts

Partition names must be identical when configuring a disk usage alert for multiple nodes.

When configuring a disk usage alert for multiple nodes, the partition names must be named the same on every node. For example, if you want to alert when disk space on your commitlog partition is running low, the commitlog partition must be named the same on every node. Currently, the OpsCenter UI only displays the drives from one of the nodes.