MEDIUM: acl: associate "struct sample_storage" to each "struct acl_pattern"

MEDIUM: acl: associate "struct sample_storage" to each "struct acl_pattern"

This will be used later with maps. Each map will associate an entry with
a sample_storage value.

This patch changes the "parse" prototype and all the parsing methods.
The goal is to associate "struct sample_storage" to each entry of
"struct acl_pattern". Only the "parse" function can add the sample value
into the "struct acl_pattern".