Renamed some checks, add new checks that check permissions and ownership on /etc/passwd, /etc/shadow, ...
Add new function in utils that checks that check that the file ownership is one of the authrized ownership.
renamed: bin/hardening/6.1.5_etc_passwd_permissions.sh -> bin/hardening/6.1.2_etc_passwd_permissions.sh
new file: bin/hardening/6.1.3_etc_gshadow-_permissions.sh
renamed: bin/hardening/6.1.6_etc_shadow_permissions.sh -> bin/hardening/6.1.4_etc_shadow_permissions.sh
renamed: bin/hardening/6.1.7_etc_group_permissions.sh -> bin/hardening/6.1.5_etc_group_permissions.sh
new file: bin/hardening/6.1.6_etc_passwd-_permissions.sh
new file: bin/hardening/6.1.7_etc_shadow-_permissions.sh
new file: bin/hardening/6.1.8_etc_group-_permissions.sh
new file: bin/hardening/6.1.9_etc_gshadow_permissions.sh
modified: lib/utils.sh
renamed: tests/hardening/6.1.5_etc_passwd_permissions.sh -> tests/hardening/6.1.2_etc_passwd_permissions.sh
new file: tests/hardening/6.1.3_etc_gshadow-_permissions.sh
renamed: tests/hardening/6.1.6_etc_shadow_permissions.sh -> tests/hardening/6.1.4_etc_shadow_permissions.sh
renamed: tests/hardening/6.1.7_etc_group_permissions.sh -> tests/hardening/6.1.5_etc_group_permissions.sh
new file: tests/hardening/6.1.6_etc_passwd-_permissions.sh
new file: tests/hardening/6.1.7_etc_shadow-_permissions.sh
new file: tests/hardening/6.1.8_etc_group-_permissions.sh
new file: tests/hardening/6.1.9_etc_gshadow_permissions.sh