FileTargetTests: Supplemented ReplaceFileContentsOnEachWriteTest() to test with and without header and footer

[bhaeussermann]

No description provided.

[codecov-io]

Current coverage is 74.00%

Merging #1208 into master will increase coverage by +0.06% as of a30b607

@@            master   #1208   diff @@
======================================
  Files          265     265       
  Stmts        15297   15296     -1
  Branches      1679    1679       
  Methods          0       0       
======================================
+ Hit          11312   11320     +8
+ Partial        419     417     -2
+ Missed        3566    3559     -7

Review entire Coverage Diff as of a30b607

---

Uncovered Suggestions

1. +0.09% via ...argets/FileTarget.cs#1722...1734
2. +0.08% via ...gingConfiguration.cs#282...293
3. +0.08% via ...gingConfiguration.cs#244...255
4. See 7 more...

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[304NotModified]

Thanks! 74%!! :)