apps/fscmd: hide util 'df' if mountpoints are disabled
apps/fscmd: hide util 'df' if mountpoints are disabled

* 'df' utilities task is to show filesystem info, but it
  is meaningless when mountpoints are disabled and hence
  no user filesystems are supported.

Signed-off-by: Oleg Lyovin <9e7fd33cf90c7e429276114f54b1f8488150523e@partner.samsung.com>

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