Upgrade to pants 0.0.70.
Upgrade to pants 0.0.70.

This bumps us to last week's regular weekly release.
The changelog is here:
  http://pantsbuild.github.io/changelog.html

No changes of note directly impacting Aurora, just keeping up
with the release train.

Testing Done:
Locally green:
```
./build-support/jenkins/build.sh
./src/test/sh/org/apache/aurora/e2e/test_end_to_end.sh
```

Reviewed at https://reviews.apache.org/r/43098/

apache/aurora,crashlytics/aurora,apache/aurora,medallia/aurora,thinker0/aurora,protochron/aurora,rdelval/aurora,protochron/aurora,rdelval/aurora,medallia/aurora,protochron/aurora,apache/aurora,crashlytics/aurora,rdelval/aurora,thinker0/aurora,medallia/aurora,thinker0/aurora,medallia/aurora,crashlytics/aurora,medallia/aurora,medallia/aurora,apache/aurora,protochron/aurora,thinker0/aurora,protochron/aurora,rdelval/aurora,thinker0/aurora,rdelval/aurora,apache/aurora,rdelval/aurora,crashlytics/aurora,thinker0/aurora,crashlytics/aurora,protochron/aurora,crashlytics/aurora,apache/aurora