[Impala-ASF-CR] IMPALA-8065: Add OS distribution name in OSInfo

["Xiaomeng Zhang (Code Review)" <ge...@cloudera.org>]

Xiaomeng Zhang has uploaded a new patch set (#9). ( http://gerrit.cloudera.org:8080/14531 )

Change subject: IMPALA-8065: Add OS distribution name in OSInfo
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IMPALA-8065: Add OS distribution name in OSInfo

Before this change OsInfo::DebugString() would print two lines:
- OS version: the long name of the Linux kernel from /proc/version
- Clock: the type of clock used
After this change OsInfo::DebugString() will print three lines:
- OS distribution: the short name of the OS release.
  If Docker is being used this is the name of the Container OS.
- OS version: the long name of the Linux kernel from /proc/version.
  If Docker is being used this is the description of the Host Kernel.
- Clock: the type of clock used.

Tested locally, the displayed OS Info in Ubuntu16 dev box is:
OS distribution: Ubuntu 16.04.6 LTS
OS version: Linux version 4.15.0-65-generic (buildd@lcy01-amd64-017)
(gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.10))
Clock: clocksource: 'tsc', clockid_t: CLOCK_MONOTONIC

Also checked with diff OS in docker: centos, redhat, ubuntu, oracle,
debian to make sure /etc/os-release exists and PRETTY_NAME in that file.
Each OS picked one version to test.
Specially for centos6 and redhat6, which have redhat-release instead of
os-release, copied redhat-release into Ubuntu16 dev box and verified os
version in mini-cluster.

Added new backend test os-info-test.cc.

Change-Id: I848c9e53ee4e0bf8ae0874bb6da28e8efa7f7c8a
---
M be/src/util/CMakeLists.txt
A be/src/util/os-info-test.cc
M be/src/util/os-info.cc
M be/src/util/os-info.h
4 files changed, 82 insertions(+), 8 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/31/14531/9
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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I848c9e53ee4e0bf8ae0874bb6da28e8efa7f7c8a
Gerrit-Change-Number: 14531
Gerrit-PatchSet: 9
Gerrit-Owner: Xiaomeng Zhang <xi...@cloudera.com>
Gerrit-Reviewer: Andrew Sherman <as...@cloudera.com>
Gerrit-Reviewer: Impala Public Jenkins <im...@cloudera.com>
Gerrit-Reviewer: Tim Armstrong <ta...@cloudera.com>
Gerrit-Reviewer: Xiaomeng Zhang <xi...@cloudera.com>