Add a script for creating distro files

Adds a python script for creating distro files.

Sample/test execution:

./create-distro.py -iana_version=2017b \
    -tzdata=../../output_data/iana/tzdata \
    -icu=../../output_data/icu_overlay/icu_tzdata.dat \
    -tzlookup=../../output_data/android/tzlookup.xml \
    -output=./distro.zip

A shell script that did a similar job has been removed.
Two manual testing scripts have been removed and will be replaced
in future commits.

Bug: 31008728
Test: See above
Change-Id: Ie0d8dc955675a8db35fcde5bf477aaa1a950ee5a
5 files changed