Back down the minimum required java version for running Pants tools to java 7

Review Request #4314 — Created Oct. 15, 2016 and submitted — Latest diff uploaded

zundel
pants
zundel/back-down-java-to-1.7
3980
6c40516...
pants-reviews
benjyw, jsirois, stuhood, wisechengyi

The pants 1.2.0rc1 release requried java8 to run tests. This backs down that requirement to java7 for all the pants tools. (Square has hadoop dependencies that we still want to test under the Java 7 jvm.)

The change to require java 8 was introduced in:

https://rbcommons.com/s/twitter/r/4127/
https://rbcommons.com/s/twitter/r/4253/

This will also require a subsequent update to re-publish the artifacts and bump the junit-runner verison.

Passed junit tests locally
Tested the runner locally in Square's java repo

CI running at https://travis-ci.org/pantsbuild/pants/builds/168153814

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