Infrastructure

Implement the stubbed out classes found in

src/main/java/org/dataone/cn/audit/sql/
├── DatabaseManager.java
├── dao
│   ├── SystemMetadataManager.java
│   └── impl
│   └── MetacatSystemMetadataManager.java
└── impl
└── MetacatDatabaseManager.java

Define the get and update interfaces in SystemMetadataManager, and implement them in MetacatSystemMetadataManager. Define the database connection interface in DatabaseManager, and implement them in MetacatDatabaseManager.