Bug 6679 Fix scripts in admin & acqui to pass Perl::Critic

Bug 6679 Fix scripts in admin & acqui to pass Perl::Critic

Scripts in admin & acqui subdirectores weren't passing t/00-testcritic.t. This
patch add admin & acqui scripts to test case and fix various errors related to
Perl::Critic compliancy.

- Fixing a style error to pass Perl::Critic, plus silencing a warn
- More style errors, plus fixing a security issue
- Explicitly using Carp

Contrary to common belief, subroutine prototypes do not enable
compile-time checks for proper arguments. Don't use them.

Defining a named sub within another sub, does not prevent that
subroutine being global

Signed-off-by: Frédéric Demians <frederic@tamil.fr>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>