Fix HiveServer2 on Hortonworks

This fixes HiveServer2 on Hortonworks HDP 2.0, since it is pretty much unusable.

- [x] Do not install `hive-server2` package, since it doesn't exist (binaries come with hive package)
- [x] Copied `hive-server` init script for RHEL into centos/redhat/scientific template directories
- [x] Copied `hive-server` init script for Ubuntu into default

This has been tested in vagrant in CentOS 6.4 and Ubuntu 12.04 and the service starts and runs on both.