raw_template hot parameter type data migration

Changes were made to the hot syntax which prevent invalid templates
already present in the database from being loaded as part of a stack
list. This database migration forces the parameter schema type to
be lowercase.

Change-Id: Iaa4b16e9b5188e6e99cda95e1c7fb0dc11c206f7
Partial-Bug: #1274288
Merge "raw_template hot parameter type data migration"