Rewrite fusiondirectory-insert-schema based on ldap-config-manager
Perl tool ldap-schema-manager is replaced by PHP tool ldap-config-manager.
fusiondirectory-insert-schema should be rewritten to be based on ldap-config-manager but have an interface as close as possible to the previous one.
This means we need to add schema list support into ldap-config-manager which only accepts to insert schema one by one currently.