[Impala-ASF-CR] IMPALA-5736: Add impala-shell argument to set default query options

["Csaba Ringhofer (Code Review)" <ge...@cloudera.org>]

Hello Lars Volker, Matthew Jacobs, Philip Zeyliger, 

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

    http://gerrit.cloudera.org:8080/8038

to look at the new patch set (#4).

Change subject: IMPALA-5736: Add impala-shell argument to set default query options
......................................................................

IMPALA-5736: Add impala-shell argument to set default query options

Query options can be set from command line and impala rc as
key=value pairs.

Examples:
command line:
impala-shell.sh -Q MT_DOP=1 --query_option=MAX_ERRORS=200

.impalarc:
[impala.query_options]
EXPLAIN_LEVEL=2
MT_DOP=2

The options set in command line will update the ones
in impalarc one by one, so the result of the example
above will be:
EXPLAIN_LEVEL=2
MT_DOP=1
MAX_ERRORS=200

Change-Id: I26a3b67230c80a99bd246b6af205d558fec9a986
---
M shell/impala_shell.py
M shell/option_parser.py
A tests/shell/impalarc_with_query_options
M tests/shell/test_shell_interactive.py
4 files changed, 83 insertions(+), 37 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/38/8038/4
-- 
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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I26a3b67230c80a99bd246b6af205d558fec9a986
Gerrit-Change-Number: 8038
Gerrit-PatchSet: 4
Gerrit-Owner: Csaba Ringhofer <cs...@cloudera.com>
Gerrit-Reviewer: Csaba Ringhofer <cs...@cloudera.com>
Gerrit-Reviewer: Lars Volker <lv...@cloudera.com>
Gerrit-Reviewer: Matthew Jacobs <mj...@apache.org>
Gerrit-Reviewer: Philip Zeyliger <ph...@cloudera.com>