Change ControllerTest default prot to 18998

[Jackie-Jiang]

Port 8998 is commonly used, which might cause address already in use problem.
Change it to 18998 to avoid this.
Also remove redundant entries in gitignore.

[codecov-io]

Codecov Report

Merging #4259 into master will increase coverage by 6.87%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #4259      +/-   ##
============================================
+ Coverage     60.35%   67.23%   +6.87%     
  Complexity       20       20              
============================================
  Files          1165     1041     -124     
  Lines         58535    51534    -7001     
  Branches       8144     7220     -924     
============================================
- Hits          35329    34648     -681     
+ Misses        20764    14529    -6235     
+ Partials       2442     2357      -85

Impacted Files	Coverage Δ	Complexity Δ
...a/manager/realtime/RealtimeSegmentDataManager.java	50% <0%> (-50%)	0% <0%> (ø)
...pache/pinot/core/util/SortedRangeIntersection.java	83.82% <0%> (-7.36%)	0% <0%> (ø)
...e/operator/dociditerators/SortedDocIdIterator.java	55.55% <0%> (-2.78%)	0% <0%> (ø)
...g/apache/pinot/common/metrics/AbstractMetrics.java	76% <0%> (-1.34%)	0% <0%> (ø)
.../pinot/core/data/manager/BaseTableDataManager.java	92.68% <0%> (-1.22%)	0% <0%> (ø)
.../pinot/core/common/datatable/DataTableBuilder.java	78.94% <0%> (-1.17%)	0% <0%> (ø)
...core/query/executor/ServerQueryExecutorV1Impl.java	81.37% <0%> (-0.69%)	0% <0%> (ø)
...n/java/org/apache/pinot/tools/SegmentDumpTool.java
...segment/converter/PinotSegmentToJsonConverter.java
...ot/tools/query/comparison/SegmentInfoProvider.java
... and 132 more

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[jackjlli]

🚢 it