[master] merge dyndb

4224.	[func]		Added support for "dyndb", a new interface for loading
			zone data from an external database, developed by
			Red Hat for the FreeIPA project.

			DynDB drivers fully implement the BIND database
			API, and are capable of significantly better
			performance and functionality than DLZ drivers,
			while taking advantage of advanced database
			features not available in BIND such as multi-master
			replication.

			Thanks to Adam Tkac and Petr Spacek of Red Hat.
			[RT #35271]

bin/tests/system/dyndb/driver/db.h

@@ -0,0 +1,15 @@
+/**
+ * Database API implementation.
+ *
+ * Copyright (C) 2015  Red Hat ; see COPYRIGHT for license
+ */
+
+#ifndef DB_H_
+#define DB_H_
+
+isc_result_t
+create_db(isc_mem_t *mctx, dns_name_t *origin, dns_dbtype_t type,
+	  dns_rdataclass_t rdclass, unsigned int argc, char *argv[],
+	  void *driverarg, dns_db_t **dbp);
+
+#endif /* DB_H_ */