Add bootserver dropdown menu to school edit
rest: fix typo in /v3/about
rest: Clean up logging stuff
Revert "Add bootserver dropdown menu to school edit"

This reverts commit 0bbe4113043c96878be4c1507a54eb28fe17dec3.
rest: do not share dedicated ltsp servers

Do not give ltsp servers that are dedicated to specific schools to
devices that belong to any other schools.