[Impala-ASF-CR] IMPALA-7199: Add scripts to create code coverage reports

["Joe McDonnell (Code Review)" <ge...@cloudera.org>]

Hello Philip Zeyliger, 

I'd like you to reexamine a change. Please visit

    http://gerrit.cloudera.org:8080/10791

to look at the new patch set (#2).

Change subject: IMPALA-7199: Add scripts to create code coverage reports
......................................................................

IMPALA-7199: Add scripts to create code coverage reports

gcovr is a python library that uses gcov to generate
code coverage reports. This adds gcovr to the python
dependencies and adds bin/impala-gcovr to provide
easy access to gcovr's command line. gcovr 3.4
supports python 2.6+.

This also adds bin/coverage_helper.sh to provide a
simplified interface to generate reports and zero
coverage counters.

Code coverage data is written out when a program
exits, so it is important to avoid hard kills
to shut down the impalads when generating coverage.
This modifies testdata/bin/kill-all.sh to call
start-impala-cluster.py --kill when shutting down
the minicluster to try to avoid doing a hard kill.
It will still do a hard kill if impala is still
running after the softer kill.

Change-Id: I5b2e0b794c64f9343ec976de7a3f235e54d2badd
---
A bin/coverage_helper.sh
A bin/impala-gcovr
M infra/python/deps/requirements.txt
M testdata/bin/kill-all.sh
4 files changed, 111 insertions(+), 0 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/91/10791/2
-- 
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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I5b2e0b794c64f9343ec976de7a3f235e54d2badd
Gerrit-Change-Number: 10791
Gerrit-PatchSet: 2
Gerrit-Owner: Joe McDonnell <jo...@cloudera.com>
Gerrit-Reviewer: Joe McDonnell <jo...@cloudera.com>
Gerrit-Reviewer: Philip Zeyliger <ph...@cloudera.com>