[SPARK-12502][Build][Python] Script /dev/run-tests fails when IBM Java is used

[kiszk]

fix an exception with IBM JDK by removing update field from a JavaVersion tuple. This is because IBM JDK does not have information on update '_xx'

[sarutak]

ok to test.

[sarutak]

add to whitelist.

[SparkQA]

Test build #48285 has finished for PR 10463 at commit 8157ee0.

• This patch fails Spark unit tests.
• This patch merges cleanly.
• This patch adds no public classes.

[SparkQA]

Test build #48286 has finished for PR 10463 at commit 8157ee0.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds the following public classes (experimental):\n * class JavaWordBlacklist\n * class JavaDroppedWordsCounter\n * case class AssertNotNull(\n

[sarutak]

Now update is not used but it may possibly used in the future. How about leave update and say as follows?

match = re.search('(\d+)\.(\d+)\.(\d+)(_(\d+))?', raw_version_str)
...
update = match.group(5)
if  update is not None:
  update = int(update)

CC: @srowen

[srowen]

LGTM. I honestly can't imagine changing the test logic based on the patch level. If somehow we did we can add it back.

[sarutak]

O.K, I agree. Merging into master and branch-1.6. Thanks @kiszk !