Add some indexes to HostCategory and Repository
Add some indexes to HostCategory and Repository

This should help a bit the list_mirror/get_mirrors method

Devyani-Divs/mirrormanager2,pombredanne/mirrormanager2,Devyani-Divs/mirrormanager2,pombredanne/mirrormanager2,pombredanne/mirrormanager2,Devyani-Divs/mirrormanager2,pombredanne/mirrormanager2,Devyani-Divs/mirrormanager2