Shade Guava 14.0.1 for HBase 0.94

HBase 0.94 can't run against Guava 15.0 or newer.  14.0.1 is the
latest version that HBase 0.94 can use.  This is marked wontfix in the
associated HBase issue:

 https://issues.apache.org/jira/browse/HBASE-10174
Add warning above Guava version in top pom.xml
Trim old Cassandra dependency management cruft
Increase timeout in OLAPTest

An HBase execution of this test failed on my machine due to the
timeout.  Increasing it like this is not particularly robust.