Unit test case for refactored functions: PMA_server_engines
Merge branch 'master' of https://github.com/phpmyadmin/phpmyadmin into 0629_UT_serverview2
use mock data for assertion
add FEDERATED to DBI dummy data
fix the code style for UT files
Merge pull request #482 from xmujay/0629_UT_serverview2

Unit test case for refactored functions: PMA_server_engines