deal with flake8 errors in core code

Change-Id: I8ba64e3a5579427afe52a34e7445b9e6eb65a74c

code/daisy/daisy/db/sqlalchemy/migrate_repo/versions/017_add_group_list_table.py

@@ -15,7 +15,7 @@
 
 from sqlalchemy import MetaData, Table, Column
 from daisy.db.sqlalchemy.migrate_repo.schema import Text
-                                                     
+
 group_list = Column('group_list', Text())
 
 
@@ -25,4 +25,3 @@ def upgrade(migrate_engine):
 
     hosts = Table('hosts', meta, autoload=True)
     hosts.create_column(group_list)
-

code/daisy/daisy/db/sqlalchemy/migrate_repo/versions/020_add_columns_in_cinder_volumes.py

@@ -27,4 +27,3 @@ def upgrade(migrate_engine):
     cinder_volumes = Table('cinder_volumes', meta, autoload=True)
     cinder_volumes.create_column(root_pwd)
     cinder_volumes.create_column(resource_pools)
-

code/daisy/daisy/db/sqlalchemy/migrate_repo/versions/022_add_optical_switch_table.py

@@ -49,4 +49,3 @@ def upgrade(migrate_engine):
     meta.bind = migrate_engine
     tables = [define_optical_switchs_table(meta), ]
     create_tables(tables)
-

code/daisy/daisy/db/sqlalchemy/migrate_repo/versions/023_add_provider_vip_in_roles.py

@@ -4,9 +4,9 @@ meta = MetaData()
 outband_vip = Column('outband_vip', String(255))
 provider_public_vip = Column('provider_public_vip', String(255))
 
+
 def upgrade(migrate_engine):
     meta.bind = migrate_engine
     role = Table('roles', meta, autoload=True)
     role.create_column(outband_vip)
     role.create_column(provider_public_vip)
-

code/daisy/daisy/db/sqlalchemy/migrate_repo/versions/024_add_use_provider_ha_in_clusters.py

@@ -8,4 +8,3 @@ def upgrade(migrate_engine):
     meta.bind = migrate_engine
     clusters = Table('clusters', meta, autoload=True)
     clusters.create_column(use_provider_ha)
-

code/daisy/daisy/db/sqlalchemy/migrate_repo/versions/028_add_custom_name_to_networks.py

@@ -8,4 +8,3 @@ def upgrade(migrate_engine):
     meta.bind = migrate_engine
     networks = Table('networks', meta, autoload=True)
     networks.create_column(custom_name)
-