Improve volume-monitor perf
Non-trivial numbers of mounts resulted in high CPU usage due to nested GUnixMountEntry retrievals. Improve the performance by extracting mount information once and hashing.
Closes: #778
Non-trivial numbers of mounts resulted in high CPU usage due to nested GUnixMountEntry retrievals. Improve the performance by extracting mount information once and hashing.
Closes: #778