Try forcing HTTP/1.1 for pagure.io git clones
    
    The change to the curl commands to force HTTP/1.1 seems to have
    stopped them failing, so let's try doing it for the git clones
    too and see if that avoids the problem till we can work out
    what is causing it.
    
    Signed-off-by: Adam Williamson <awilliam@redhat.com>