Adjust VNI column for provisioner to text

Allows the storing of the textual cluster labels (e.g. 'upstream') as
valid VNI values in the template.

api-daemon/migrations/versions/bae4d5a77c74_pvc_version_0_9_18.py

@@ -0,0 +1,28 @@
+"""PVC version 0.9.18
+
+Revision ID: bae4d5a77c74
+Revises: 3efe890e1d87
+Create Date: 2021-06-02 15:41:40.061806
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = 'bae4d5a77c74'
+down_revision = '3efe890e1d87'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.execute('ALTER TABLE network ALTER COLUMN vni TYPE TEXT')
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.execute('ALTER TABLE network ALTER COLUMN vni TYPE INTEGER USING vni::integer')
+    # ### end Alembic commands ###