Implement goal_id, strategy_id and host_aggregate into Audit api

Modifying the api controller for audit objects to allow
creation of audit objects by specifying either an
audit_template uuid/id and/or a goal_id.

strategy_id is optional.

Partially Implements: blueprint persistent-audit-parameters
Change-Id: I7b3eae4d0752a11208f5f92ee13ab1018d8521ad

watcher/cmd/dbmanage.py

@@ -59,7 +59,7 @@ class DBCommand(object):
     @staticmethod
     def purge():
         purge.purge(CONF.command.age_in_days, CONF.command.max_number,
-                    CONF.command.audit_template, CONF.command.exclude_orphans,
+                    CONF.command.goal, CONF.command.exclude_orphans,
                     CONF.command.dry_run)
 
 
@@ -115,8 +115,8 @@ def add_command_parsers(subparsers):
                              "Prevents the deletion if exceeded. No limit if "
                              "set to None.",
                         type=int, default=None, nargs='?')
-    parser.add_argument('-t', '--audit-template',
-                        help="UUID or name of the audit template to purge.",
+    parser.add_argument('-t', '--goal',
+                        help="UUID or name of the goal to purge.",
                         type=str, default=None, nargs='?')
     parser.add_argument('-e', '--exclude-orphans', action='store_true',
                         help="Flag to indicate whether or not you want to "