DRILL-1505: Updating Session Value Doesn't Reflect In 'sys.options' Query Output
DRILL-1494: Fix annoying and unnecessary warning 'Failure while trying to load .drill file'
DRILL-1495: Test cases should log relevant message in case of expected failures
DRILL-1485: tools/verify_release.sh does not have execute permission bit set
DRILL-1409: DbVisualizer fails to connect to Drill using embedded jdbc driver
DRILL-1497: Fix test failure in o.a.drill.jdbc.test.TestMetadataDDL
DRILL-1490: Upgrade to ProGaurd 5.0
DRILL-1493: Upgrade ASM to 5.0
DRILL-1492: Update readme with supported versions of Java

* Keeping the supported Java version to 7 until we get all issues around Java 8 resolved.
DRILL-1516: When searching for the java executable, ignore directories named "java"