Created by: ZUUL42
This sets -Werror for MueLu, Stokhos, & Tempus.
Motivation and Context
This is work toward #3178 turning Werror on for all packages in the GCC 7.2.0 PR build.
My commit messages mention the appropriate GitHub issue numbers.
My code follows the code style of the affected package(s).
I have read the code contribution guidelines for this project.
All new and existing tests passed.
No new compiler warnings were introduced.