mailmap: Erik Logtenberg affiliation

Signed-off-by: M Ranga Swami Reddy <swamireddy@gmail.com>
Reviewed-by: Erik Logtenberg <erik@logtenberg.eu>
mailmap: Marco Garcês affiliation

Signed-off-by: M Ranga Swami Reddy <swamireddy@gmail.com>
Reviewed-by: Marco Garcês <marco@garces.cc>
mailmap: John Spray name normalization

Signed-off-by: M Ranga Swami Reddy <swamireddy@gmail.com>
Reviewed-by: John Spray <jspray@redhat.com>
 mailmap: M Ranga Swami Reddy name normalization

    Signed-off-by: M Ranga Swami Reddy <swamireddy@gmail.com>