Fix sahara build

The Ocata release of sahara appears to require manual initialization of
a plugin manager. It is also necessary to exclude a module that requires
an external dependency.

Change-Id: I76724f68623b625f1a37b06e5279dd583753abe7

tools/autogenerate-config-flagmappings/hooks.py

@@ -73,6 +73,12 @@ def nova_spice():
     import nova.cmd.spicehtml5proxy  # noqa
 
 
+def sahara_init():
+    from sahara.plugins import base as plugins_base
+
+    plugins_base.setup_plugins()
+
+
 def zaqar_config():
     # Zaqar registers most of its options in lazy way
     # Let's find all these options and manually register them
@@ -102,4 +108,5 @@ HOOKS = {'aodh': aodh_config,
          'keystone.common.config': keystone_config,
          'neutron': neutron_misc,
          'nova.spice': nova_spice,
+         'sahara': sahara_init,
          'zaqar': zaqar_config}

tools/autogenerate-config-flagmappings/ignore.list

@@ -11,6 +11,8 @@ glance.db.sqlalchemy.alembic_migrations.env
 keystone.assignment.role_backends.sql
 keystone.assignment.V8_backends.sql
 manila.db.migrations.alembic.env
+sahara.cli.image_pack.api
+sahara.cli.image_pack.cli
 trove.guestagent.datastore.experimental.postgresql.manager
 trove.guestagent.datastore.experimental.postgresql.service.database
 trove.guestagent.datastore.experimental.postgresql.service.root