Remove repo URL from Java build-info [skip ci]

[NvTimLiu]

Issue #6490

**Describe the bug
There is an offensive word in the cuDF java binaries.

Steps/Code to reproduce bug
Our cuDF java binaries are built from the source code of nvspark/cudf Gitlab repo, which is the down-stream of this GitHub rapidsai/cudf.

When building cuDF java binaries, the build-info is collected via the script java/buildscripts/build-info.

In this build-info (an example showing as below), the down-stream repo URL contains the offensive word.

version=0.16-SNAPSHOT
user=
revision=9ec5093e18dcea3978931288d14f0476b58347ae
branch=HEAD
date=2020-09-27T03:53:03Z
url=https://gitlab-master.nvidia.com/nvspark/cudf.git
This build-info will be packaged into the cuDF binaries, and be released onto public maven repo.

Expected behavior
cuDF java binaries should not have any offensive word.

Remove down-stream repo URL from build-info.

[GPUtester]

Please update the changelog in order to start CI tests.

View the gpuCI docs here.

[jlowe]

Looks OK except CHANGELOG.md needs to be updated.

[codecov]

Codecov Report

Merging #6491 into branch-0.16 will decrease coverage by 1.47%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           branch-0.16    #6491      +/-   ##
===============================================
- Coverage        84.45%   82.97%   -1.48%     
===============================================
  Files               82       95      +13     
  Lines            13846    14900    +1054     
===============================================
+ Hits             11694    12364     +670     
- Misses            2152     2536     +384     

Impacted Files	Coverage Δ
python/cudf/cudf/utils/gpu_utils.py	53.65% <0.00%> (-4.88%)	⬇️
python/cudf/cudf/core/abc.py	87.23% <0.00%> (-4.26%)	⬇️
python/dask_cudf/dask_cudf/io/orc.py	90.90% <0.00%> (-1.28%)	⬇️
python/dask_cudf/dask_cudf/io/parquet.py	91.35% <0.00%> (-0.85%)	⬇️
python/cudf/cudf/utils/cudautils.py	48.55% <0.00%> (-0.74%)	⬇️
python/cudf/cudf/_version.py	44.80% <0.00%> (-0.72%)	⬇️
python/cudf/cudf/core/frame.py	89.86% <0.00%> (-0.53%)	⬇️
python/cudf/cudf/io/parquet.py	91.73% <0.00%> (-0.50%)	⬇️
python/dask_cudf/dask_cudf/core.py	75.64% <0.00%> (-0.26%)	⬇️
python/cudf/cudf/core/column/categorical.py	93.11% <0.00%> (-0.26%)	⬇️
... and 42 more

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[NvTimLiu]

Looks OK except CHANGELOG.md needs to be updated.

@jlowe Thanks for your review, updated CHANGELOG.md