migrate indexer to spring boot/cloud

indexer-service-azure/pom.xml

...c/main/java/org/opendes/util/indexer/RequestInfoImpl.java

indexer-service-gcp/pom.xml

.../main/java/org/opendes/indexer/publish/PublisherImpl.java

...c/main/java/org/opendes/indexer/util/RequestInfoImpl.java

indexer-service-root/pom.xml

...in/java/org/opendes/indexer/middleware/IndexerFilter.java

...src/main/java/org/opendes/indexer/publish/IPublisher.java

.../java/org/opendes/indexer/service/IndexerServiceImpl.java

.../java/org/opendes/indexer/service/ReindexServiceImpl.java

.../src/main/java/org/opendes/indexer/util/IRequestInfo.java

...ava/org/opendes/indexer/util/IndexerQueueTaskBuilder.java

...est/java/org/opendes/indexer/logging/JaxRsDpsLogTest.java