Bug 17776: (QA follow-up) Consistent regex for Plack detection

Bug 17776: (QA follow-up) Consistent regex for Plack detection

Synchronizing:
C4/Auth_with_shibboleth.pm:    if ( any { /(^psgi|^plack)/i } keys %ENV ) {
Koha/AuthUtils.pm:    if ( ( any { /(^psgi\.|^plack\.)/i } keys %ENV ) && $ENV{SCRIPT_NAME} =~ m,^/(intranet|opac)(.*), ) {
about.pl:if ( any { /(^psgi\.|^plack\.)/i } keys %ENV ) {

Actually we should move it to a subroutine. New report please.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>