Removed functions.util.* as they don't seem to be used (for many years).

[ham1]

Description

Remove files which don't seem to be used, they have a TODO comment from 2008 and hasn't been meaningfully changed since 2003.

How Has This Been Tested?

Unit tests.

[codecov-io]

Codecov Report

Merging #335 into trunk will increase coverage by <.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##              trunk     #335      +/-   ##
============================================
+ Coverage     57.91%   57.91%   +<.01%     
+ Complexity    10025    10024       -1     
============================================
  Files          1148     1146       -2     
  Lines         73789    73781       -8     
  Branches       7328     7328              
============================================
- Hits          42734    42733       -1     
+ Misses        28577    28570       -7     
  Partials       2478     2478

Impacted Files	Coverage Δ	Complexity Δ
...c/core/org/apache/jmeter/reporters/Summariser.java	85.38% <0%> (-0.77%)	18% <0%> (-1%)

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