Store the policy JSON columns as TEXT for MySQL 5.6

The branch stored scopejson, desiredstate and params as sa.JSON, the only JSON
columns in the product. MySQL 5.6 has no JSON type - it arrived in 5.7 - and the
migration failed there with a bare syntax error near the word JSON.

They are TEXT now, through a JSONText type decorator, so the seventeen call sites
still assign and read dicts. The convention elsewhere is already TEXT:
guides.blocksjson, geenforce.manifestjson.

Spec regenerated: 331 paths, 477 operations across 22 surfaces.

plugins/computers/migrations/versions/0004_policies.py

@@ -22,6 +22,14 @@ branch_labels = None
 depends_on = None
 
 
+# TEXT rather than sa.JSON on purpose. MySQL 5.6 has no JSON type - it arrived
+# in 5.7 - and this migration failed there with a bare syntax error near the
+# word JSON. Every other JSON-bearing column in the product is TEXT for the same
+# reason (guides.blocksjson, geenforce.manifestjson); the model reads and writes
+# dicts through the JSONText type decorator, so nothing above the database
+# changes.
+
+
 def upgrade():
     bind = op.get_bind()
     insp = sa.inspect(bind)
@@ -33,7 +41,7 @@ def upgrade():
             sa.Column('configurationpolicyid', sa.Integer(), nullable=False),
             sa.Column('name', sa.String(length=150), nullable=False),
             sa.Column('description', sa.Text(), nullable=True),
-            sa.Column('scopejson', sa.JSON(), nullable=True),
+            sa.Column('scopejson', sa.Text(), nullable=True),
             sa.Column('source', sa.String(length=50), nullable=False,
                       server_default='local'),
             sa.Column('createddate', sa.DateTime(), nullable=False),
@@ -57,8 +65,8 @@ def upgrade():
             sa.Column('action', sa.String(length=100), nullable=False),
             sa.Column('mode', sa.String(length=20), nullable=False,
                       server_default='gate'),
-            sa.Column('desiredstate', sa.JSON(), nullable=True),
-            sa.Column('params', sa.JSON(), nullable=True),
+            sa.Column('desiredstate', sa.Text(), nullable=True),
+            sa.Column('params', sa.Text(), nullable=True),
             sa.Column('intervalminutes', sa.Integer(), nullable=True),
             sa.Column('sortorder', sa.Integer(), nullable=False,
                       server_default='0'),