ARROW-5296: [Java] Ignore timeout-based Flight tests for now

[ghost]

No description provided.

[ghost]

@pitrou to get you unblocked for now. I'd like to figure out how to set up JUnit/Maven so we can still run these tests locally easily.

[pitrou]

No worries, this is not blocking me. Just something I noticed when working on unrelated stuff.

[codecov-io]

Codecov Report

Merging #4286 into master will increase coverage by 1.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4286      +/-   ##
==========================================
+ Coverage   88.46%   89.48%   +1.02%     
==========================================
  Files         773      628     -145     
  Lines       95602    84203   -11399     
  Branches     1251        0    -1251     
==========================================
- Hits        84576    75352    -9224     
+ Misses      10790     8851    -1939     
+ Partials      236        0     -236

Impacted Files	Coverage Δ
cpp/src/plasma/thirdparty/ae/ae.c	70.75% <0%> (-0.95%)	⬇️
go/arrow/ipc/writer.go
go/arrow/math/uint64_amd64.go
go/arrow/memory/memory_avx2_amd64.go
go/arrow/ipc/file_reader.go
js/src/enum.ts
go/arrow/array/builder.go
js/src/Arrow.node.ts
js/src/schema.ts
go/arrow/type_traits_boolean.go
... and 137 more

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[wesm]

+1