ARROW-2915: [Packaging] Remove artifact form ubuntu-trusty build

[kszucs]

@kou please review

Is there another artifact with different extension I should append?

[codecov-io]

Codecov Report

Merging #2325 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2325      +/-   ##
==========================================
- Coverage   84.45%   84.45%   -0.01%     
==========================================
  Files         293      293              
  Lines       45064    45064              
==========================================
- Hits        38061    38060       -1     
- Misses       6972     6973       +1     
  Partials       31       31

Impacted Files	Coverage Δ
cpp/src/arrow/util/thread-pool-test.cc	98.91% <0%> (-0.55%)	⬇️

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[kou]

Ah, apache-arrow_{version}-1.debian.tar.gz (xz->gz) must exist.

[kszucs]

Waiting for build: https://travis-ci.org/kszucs/crossbow/builds/408490426
Assets: https://github.com/kszucs/crossbow/releases/tag/build-266-ubuntu-trusty

[kszucs]

It works!

[wesm]

+1

[kou]

Thanks!