FEATURE: Check for mountpoint during Elastic size limit calculations #12308
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Instead of just directory existence, this checks if the directories are separate mountpoints when determining disk size and log_size_limit calculations.
It also sets the percentage to 80 if /nsm/elasticsearch is a separate mountpoint. This allows for better disk utilization on server configurations where /nsm is based on large slow HDDs for increased PCAP retention but /nsm/elasticsearch is based on SSDs for faster Elasticsearch performance.
The mountpoint command has been in RHEL and derivatives at least to RHEL7, and debian and derivatives for just as long.