Issue Summary

If you have a dashboard that references two or more queries that each have a non-global parameter with the same name one parameter's value will overwrite the others'.

Steps to Reproduce

1. Create Query1 and Query2 each with a non-global template named "a_parameter".
2. Set "a_parameter" to 1 in Query1 and 2 in Query2.
3. Add both queries as tables to the same dashboard.
   One query's "a_parameter" value will overwrite the other query's.

Any other info e.g. Why do you consider this to be a bug? What did you expect to happen instead?
I consider this to be a bug. I expect that, if a parameter is set to non-local, it will not interact with any other parameter in a given dashboard.