D15798: [Fstab] Show non-empty share name in case root fs is exported

[Stefan Brüns]

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REVISION SUMMARY
  The leading slash is stripped to save some space for the human readable
  description ("share on server"). In case of an exported root filesystem,
  this creates an empty export name, so readd the slash.

TEST PLAN
  Create two entries in fstab:
  `server:/  /mnt/a/ nfs defaults 0 0`
  `server:/b /mnt/b/ nfs defaults 0 0`
  run e.g. solid-hardware5 list details
  result
  ` description = '/ on server'`
  ` description = 'b on server'`

REPOSITORY
  R245 Solid

BRANCH
  ensure_nonempty_nfs_exportname

REVISION DETAIL
  https://phabricator.kde.org/D15798

AFFECTED FILES
  src/solid/devices/backends/fstab/fstabdevice.cpp

To: bruns, #frameworks
Cc: kde-frameworks-devel, michaelh, ngraham, bruns
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