option_parser: Fix inner bracket support with list of integers

Give the option parser the ability to handle tuples with inner brackets
containing list of integers. The following example can now be handled
correctly "option=[key@[v1-v2,v3,v4]]" which means the option is
assigned a tuple with a key associated with a list of integers between
the range v1 - v2, as well as v3 and v4.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>

vmm/src/config.rs

@@ -1942,7 +1942,7 @@ impl NumaConfig {
             .map_err(Error::ParseNuma)?
             .map(|v| v.0.iter().map(|e| *e as u8).collect());
         let distances = parser
-            .convert::<Tuple<u64>>("distances")
+            .convert::<Tuple<u64, u64>>("distances")
             .map_err(Error::ParseNuma)?
             .map(|v| {
                 v.0.iter()