ECL-174 enable multiple hosts in cassandra config
Conflicts:
	service/mcs/persistent/pom.xml
	service/uis/persistent/src/main/java/eu/europeana/cloud/service/uis/persistent/dao/CassandraCloudIdDAO.java
	service/uis/persistent/src/main/java/eu/europeana/cloud/service/uis/persistent/dao/CassandraLocalIdDAO.java
	service/uis/rest/src/test/java/eu/europeana/cloud/service/uis/DataProviderResourceTest.java
	service/uis/rest/src/test/java/eu/europeana/cloud/service/uis/UniqueIdentifierResourceTest.java