resultsdb / staging: fix name from old phx2 resultsdb to new iad2 one
    
    In phx2 we had resultsdb-stg01.qa.fedoraproject.org, but now in iad2, we
    have resultsdb01.stg.iad2.fedoraproject.org.
    
    Signed-off-by: Kevin Fenzi <kevin@scrye.com>