load POSIX module correctly, only where needed

bin/account-manager-client.pl

@@ -12,7 +12,6 @@ use utf8;
 use lib qw(lib conf);
 
 use Getopt::Long qw(:config auto_help);
-use POSIX;
 use Pod::Usage;
 
 use IdPAccountManager::TestAccount;

bin/account-manager-web.pl

@@ -17,8 +17,6 @@ use CGI::Util;
 use Template;
 use Template::Constants qw( :debug );
 
-use POSIX;
-
 use IdPAccountManager::TestAccount;
 use IdPAccountManager::SAMLMetadata;
 use IdPAccountManager::ServiceProvider;

lib/IdPAccountManager/AuthenticationToken.pm

@@ -13,6 +13,7 @@ use IdPAccountManager::Tools;
 use Conf;
 
 use Digest::MD5;
+use POSIX qw(strftime);
 
 require Exporter;
 my @ISA    = qw(Exporter);

lib/IdPAccountManager/TestAccount.pm

@@ -11,6 +11,7 @@ use IdPAccountManager::Data::Testaccount::Manager;
 
 use IdPAccountManager::Tools;
 use Conf;
+use POSIX qw(strftime);
 
 require Exporter;
 my @ISA    = qw(Exporter);

lib/IdPAccountManager/Tools.pm

@@ -11,6 +11,7 @@ use Template::Stash;
 
 use Digest::SHA;
 use Encode;
+use POSIX qw(strftime);
 
 my %log_levels =
   ('debug' => 0, 'info' => 1, 'trace' => 1, 'notice' => 2, 'error' => 3);