Increase import timeout from 2 to 4 minutes

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
Merge branch 'increase-import-timeout' into 'master'

Increase import timeout

Increase import timeout from 2 to 4 minutes. It allows repositories like `gitlabhq` be imported via UI

See merge request !1013