gh-984: Change usage of log4j to slf4j (#985)

[t92549]

• Replace direct usages of log4j with slf4j #984: Change usage of log4j to slf4j

Related Issue

• Resolve Cherry-pick slf4j changes into v2-alpha #988

[codecov-commenter]

Codecov Report

Merging #989 (f7d3163) into v2-alpha (d856cd7) will not change coverage.
The diff coverage is 66.66%.

@@             Coverage Diff             @@
##             v2-alpha     #989   +/-   ##
===========================================
  Coverage       45.00%   45.00%           
  Complexity        101      101           
===========================================
  Files              25       25           
  Lines             900      900           
  Branches           74       74           
===========================================
  Hits              405      405           
  Misses            465      465           
  Partials           30       30           

Impacted Files	Coverage Δ
...niaccumulocluster/MiniAccumuloShellController.java	0.00% <0.00%> (ø)
...accumulocluster/MiniAccumuloClusterController.java	36.74% <100.00%> (ø)
...tgeneration/cache/PreferentialAttachmentCache.java	65.30% <100.00%> (ø)

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