GET-STORAGE-INFO error and other issues

[tim-moody]

• the program to invoke df is read from the vars/.yml file during installation
• a parameter, -x fuse.portal, has been introduced to fix a flaw on Linux Mint
• GET-STORAGE-INFO (function get_storage_info_lite()) does not work if any parameters are present
• additionally it is desirable to add the parameter -a to support bind mounts

[tim-moody]

Adding -a also makes the output very verbose. So an additional question is whether we should just live with this in Utilities Display System Storage, since this is information only, or filter the output.
The parameter -t ext4 would restrict to that file type but might be too restrictive.

[jvonau]

findmnt -s might be useful somewhere and @holta note https://github.com/iiab/iiab/blob/master/scripts/iiab-diagnostics#L200 might want to use -ah

[holta]

https://github.com/iiab/iiab/blob/master/scripts/iiab-diagnostics#L200 might want to use -ah

Ok!