Some common class names are changing in the shared python test modules

[David Knupp <dk...@cloudera.com>]

We're trying to update pytest in the Impala python environment to a more 
recent version, in order to take advantage of a few bug fixes that have 
been introduced since our existing version: 2.7.2 (which is going on two 
years old.)

However, some of our current test code doesn't play nicely with pytest's 
default auto-discovery mechanism, which is sensitive the names of test 
modules, classes, and functions -- even ones that are imported from 
other locations. This is not really a big issue, and it may have been 
true all along, but later versions of pytest have started to emit 
explicit warnings about it.

The simple fix was to simply rename some the problematic classes, 
specifically TestMatrix, TestVector, and TestDimension. These are now 
called ImpalaTestMatrix, ImpalaTestVector, and ImpalaTestDimension. Of 
course, all of the test modules have been updated to reflect this as well.

This is just a courtesy message to let you know that this change has 
been +2'ed and will be cherry-picked soon. If you have in-flight patches 
right now in which you have added new test modules, classes, etc., these 
tests may fail until you update your code to use the new names.

The review in question is https://gerrit.cloudera.org/#/c/5794/.

Thanks.
-- 
David Knupp
Software Engineer
Cloudera
415-312-1049
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