Fix filetarget: Thread was being aborted

[304NotModified]

Fix filetarget: Thread was being aborted

Thread.Sleep can throw a ThreadAbortException

Fixes #1385

[codecov-io]

Current coverage is 75.19%

Merging #1387 into master will increase coverage by +0.02% as of e577f9c

@@            master   #1387   diff @@
======================================
  Files          267     267       
  Stmts        15554   15560     +6
  Branches      1636    1636       
  Methods          0       0       
======================================
+ Hit          11692   11701     +9
+ Partial        385     384     -1
+ Missed        3477    3475     -2

Review entire Coverage Diff as of e577f9c

---

Uncovered Suggestions

1. +0.09% via ...gingConfiguration.cs#374...387
2. +0.09% via ...gingConfiguration.cs#340...353
3. +0.09% via ...argets/FileTarget.cs#1741...1753
4. See 7 more...

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