AMBARI-6901. Flume agents are absent after configuring flume.conf and restart. (jaimin)
AMBARI-6902. LDAP uses redundant properties from ambari configuration. (mahadev)
AMBARI-6868 - Ambari should disable web directory listing by default (Alejandro Fernandez via jonathanhurley)
AMBARI-6903: Fix Maven deprecation warnings

Certain `pom.xml` files are using old/ deprecated property references.
Replace and use new property references.