Revert "Increase the Environment variable column length"

This reverts commit 98a6433b9a.

Before this can be cherry-picked, earlier migrations must also be
included, otherwise, it will break on upgrade.

Change-Id: I94c5aaac143fd4876349a40ec4d2315c36376e3e

mistral/db/sqlalchemy/migration/alembic_migrations/versions/020_increase_env_columns_size.py

@@ -1,35 +0,0 @@
-# Copyright 2015 OpenStack Foundation.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#    http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
-# implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-"""Increase environments_v2 column size from JsonDictType to JsonLongDictType
-
-Revision ID: 020
-Revises: 019
-Create Date: 2017-06-13 13:29:41.636094
-
-"""
-
-# revision identifiers, used by Alembic.
-revision = '020'
-down_revision = '019'
-
-from alembic import op
-from mistral.db.sqlalchemy import types as st
-
-
-def upgrade():
-    # Changing column types from JsonDictType to JsonLongDictType
-    op.alter_column('environments_v2', 'variables',
-                    type_=st.JsonLongDictType())

mistral/db/v2/sqlalchemy/models.py

@@ -366,7 +366,7 @@ class Environment(mb.MistralSecureModelBase):
     id = mb.id_column()
     name = sa.Column(sa.String(200))
     description = sa.Column(sa.Text())
-    variables = sa.Column(st.JsonLongDictType())
+    variables = sa.Column(st.JsonDictType())
 
 
 class CronTrigger(mb.MistralSecureModelBase):