Nhse d30 eldb275 - Githubissues

Improved verify_basic_upgrade test that now detects issues with compression:

Test is retried with each compression options enabled, so non-default compression is verified.
Test now uses sufficient data to trigger use of compression.
Test now detects silent failure of compression due to compilation issues (e.g. https://github.com/basho/eleveldb/issues/275)

nhs-riak / riak_test