Disk space monitoring issues

[guillomovitch]

Disk space monitoring assume than log files are stored on the same partition as the code itself, given this code in minemeld/traced/writer.py file:
perc_used = psutil.disk_usage('.').percent
If logs are stored on a distinct partition, this test is just useless.

Moreover, whereas the treshold is actuallly configurable, via a 'treshold' directive traced.yml configuration file, the 70% value is actually hardcoded in the UI, given this code in src/app/system/dashboard.view.html file:
<div ng-if="vm.system.disk >= 70" class="row m-t-xs">

Even with a treshold set to 100 to disable the test, the error message will still appears.

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