CDH 5.7.0 includes Hive 1.1.0 with additional patches. Changing the version of an individual component in the distribution is neither trivial nor supported.
Is there a particular patch or feature in 2.0.0 you're looking for? You might want to look at our branch of the source code ( https://github.com/cloudera/hive/tree/cdh5-1.1.0_5.7.0). Although the release is based on the 1.1.0 Apache release, other patches may have been backported to Cloudera's release, so it's possibly CDH 5.7.0 already includes what you're looking for.