get_maintainer.pl: slightly modify penguin_chief

get_maintainer.pl: slightly modify penguin_chief

Penguin chiefs are actually stripped out from get_maintainer results unless
--git-chief-penguins is provided, which appends them to all results instead.

This is a issue for U-Boot since Tom Rini (penguin chief) is also maintainer
of some sub-trees ("ARM", "ARM TI" and "THE REST").

Hopefully, this match is performed case-senditive over name and email,
therefore upper-casing Tom Rini last name workarounds the issue.

Important note: This also fixes "THE REST" catch all section resulting
in Tom Rini listed as (maintainer:THE REST) for all files. Hope there is not
too much developers scripting their patch email header from get_maintainer.pl
output, otherwise Tom Rini may be flooded.

Cc: Tom Rini <trini@konsulko.com>
Signed-off-by: Anthony Loiseau <anthony.loiseau@allcircuits.com>