with hive.

org.apache.hadoop.metadata.hive.*

so the hook will now be: org.apache.hadoop.metadata.hive.Hook for the
pre/post/failure hook.

Conflicts:
	repository/pom.xml
	repository/src/main/java/org/apache/hadoop/metadata/services/GraphBackedMetadataRepository.java
	repository/src/main/java/org/apache/hadoop/metadata/services/MetadataRepository.java
	repository/src/main/java/org/apache/hadoop/metadata/services/TitanGraphService.java
	repository/src/test/java/org/apache/hadoop/metadata/services/GraphBackedMetadataRepositoryTest.java
	webapp/src/main/java/org/apache/hadoop/metadata/web/resources/EntityResource.java
	webapp/src/main/resources/application.properties
	webapp/src/test/java/org/apache/hadoop/metadata/GraphRepositoryServiceIT.java

they are not services and made more sense with simpler, shorter names

ServiceInitializer and Services collection no longer exist and have been
replaced by Guice dependency injection.
Added comments and improved testability.
Maven verify now runs - almost ready for CI (issues with keytool maven
plugin)

properties file

and the test parses the GUID as expected

with integration tests (specifically the metadata.keystore file &
keystore plugin), but int tests are otherwise loading Guice
dependency-injected instances correctly.