Added database setting

Fixes #12
Merge pull request #38 from jprovaznik/db2

Added database setting
* Refactor to use new details region
* Fix name property on details page
Add properties for buttons, and fully move actionchains import to
toplevel
* Move code to ManagementSystemsAdd page
* Update test to match
Fix power button tests
Switch to using body id to identify subpage
Fix logout link
Fix pxe select dropdown