[SPARK-20064][PySpark] Bump the PySpark verison number to 2.2

[setjet]

What changes were proposed in this pull request?

PySpark version in version.py was lagging behind
Versioning is in line with PEP 440: https://www.python.org/dev/peps/pep-0440/

How was this patch tested?

Simply rebuild the project with existing tests

[holdenk]

Jenkins OK to test.

[holdenk]

Thanks for doing this @setjet & welcome to the Spark project :) This change looks good pending jenkins, if everything passes I'll merge it tonight.

For others looking at this PR wondering, make-distribution writes its own version number when building but this version number is used for development builds so keeping it up-to-date is useful.

[HyukjinKwon]

(it would be nicer if the title is fixed to indicate what it proposes in short)

[felixcheung]

please update the PR title

[setjet]

Done :)

[holdenk]

not sure why Jenkins hasn't triggured. Lets try Jenkins Test This Please

[felixcheung]

probably need someone who can command Jenkins
(I can't)

[holdenk]

In theory I can command Jenkins (the pr-status board says "asked to test" rather than "admin needed" but idk).
Lets see if Jenkins retest this please does anything.

[SparkQA]

Test build #3642 has finished for PR 17523 at commit 47e4ab2.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[srowen]

Merged to master

[holdenk]

Thanks for your first contribution to Spark :)