Fix tests and migrated to ``_getrepo``
    
    The ``issue`` api changed its architecture to use a different way of getting
    the repo. The refactoring is amazing since now only one function is required to
    make a get repo call.
    
    This commit also fixes few test cases and modified the test json for the same.
    The alembic revision file is updated with the new revision.
    
    Signed-off-by: Farhaan Bukhsh <farhaan.bukhsh@gmail.com></farhaan.bukhsh@gmail.com>