CDK-421: Refactor kite-tools, extract parent POM.

This splits kite-tools into a parent POM and a runtime POM. The runtime
project is named kite-tools so that artifact names do not change.

This also changes the packaging to use the maven-assembly-plugin rather
than the maven-shade-plugin. The assembly plugin doesn't requires a
whitelist of artifacts to include and should be more maintainable. The
shaded or assembled artifact name has not changed.

This removes the broken java command to run the CLI when Hadoop can't be
found.
CDK-421: Add kite-tools-cdh5 module.

This adds a kite-tools assembly for CDH5 packaged as a tarball and a zip
file. The assemblies contain a lib folder with all runtime and provided
dependencies for CDH5 (managed by the kite-tools-cdh5 pom) and a shell
script in bin called kite-dataset that looks for ../lib/* dependencies.
The bin script uses KITE_CLASSPATH for the lib folder, which can be
overridden. It also adds HADOOP_CONF_DIR and HIVE_CONF_DIR to the
classpath if those variables are set and are directories.