Adapt each/keys usage to conform to Perl versions prior to 5.14.

Starting with Perl 5.14, arguments are dereferenced automatically but this is
experimental and may change in future version.
By relying on such behavior the script is not compatible with Perl version prior
to 5.14.

Changes make script work on both 5.14 and 5.10 (actually tested on 5.10.1).
Merge branch 'bugfix/3-Wrong_type_to_each_and_key_arg'
Merge branch 'master' of github.com:C-Duv/sysadmin-scripts