Set sane defaults for required conf params in trove/common/cfg.py

The following conf options are required and should have their defaults
set to sane values which make sense for the reference implementation:
ignore_dbs, ignore_users, admin_roles, and api_extensions_path

Change-Id: I2d78e9a06cb56832297d38a8fc4608964bca6976
Fixes: bug 1226496

etc/trove/trove-guestagent.conf.sample

@@ -64,6 +64,10 @@ rabbit_host=10.0.0.1
 log_dir = /tmp/
 log_file = logfile.txt
 
+# Users to ignore for user create/list/delete operations
+ignore_users = os_admin
+ignore_dbs = lost+found, mysql, information_schema
+
 # Strategy information for backups
 backup_strategy = InnoBackupEx
 backup_namespace = trove.guestagent.strategies.backup.impl

trove/common/cfg.py

@@ -34,7 +34,7 @@ common_opts = [
     cfg.IntOpt('sql_idle_timeout', default=3600),
     cfg.BoolOpt('sql_query_log', default=False),
     cfg.IntOpt('bind_port', default=8779),
-    cfg.StrOpt('api_extensions_path', default='',
+    cfg.StrOpt('api_extensions_path', default='trove/extensions/routes',
                help='Path to extensions'),
     cfg.StrOpt('api_paste_config',
                default="api-paste.ini",
@@ -45,7 +45,7 @@ common_opts = [
     cfg.BoolOpt('trove_volume_support',
                 default=True,
                 help='File name for the paste.deploy config for trove-api'),
-    cfg.ListOpt('admin_roles', default=[]),
+    cfg.ListOpt('admin_roles', default=['admin']),
     cfg.StrOpt('remote_implementation',
                default="real",
                help='Remote implementation for using fake integration code'),
@@ -77,8 +77,10 @@ common_opts = [
     cfg.IntOpt('users_page_size', default=20),
     cfg.IntOpt('databases_page_size', default=20),
     cfg.IntOpt('instances_page_size', default=20),
-    cfg.ListOpt('ignore_users', default=[]),
-    cfg.ListOpt('ignore_dbs', default=[]),
+    cfg.ListOpt('ignore_users', default=['os_admin', 'root']),
+    cfg.ListOpt('ignore_dbs', default=['lost+found',
+                                       'mysql',
+                                       'information_schema']),
     cfg.IntOpt('agent_call_low_timeout', default=5),
     cfg.IntOpt('agent_call_high_timeout', default=60),
     cfg.StrOpt('guest_id', default=None),

trove/guestagent/manager/mysql_service.py

@@ -891,7 +891,7 @@ class MySqlRootAccess(object):
     @classmethod
     def enable_root(cls):
         """Enable the root user global access and/or reset the root password"""
-        user = models.MySQLUser()
+        user = models.RootUser()
         user.name = "root"
         user.host = "%"
         user.password = generate_random_password()