Fix for Guava and jclouds issue #1196
bump jclouds to 1.7.1 (where new guava is used)
update bouncycastle to align with jclouds - needed to prevent security exceptions about signed/sealed packages
revert guava bump, as per #1197
Merge pull request #1217 from ahgittin/review-jclouds-171

update to jclouds 171, plus bouncycastle updates, and some guava prep for 16.0.1