Do not check all repositories when importing repositories

- All repositories are initially filterable
- When user checked repositories these checked repositories are not 
  filtered

Bug: 444778
Change-Id: I47d26c7cf8afca105897f4aa4840f8093d9ffb96
Signed-off-by: Wim Jongman <wim.jongman@remainsoftware.com>
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
Merge "Do not check all repositories when importing repositories"