OCaml: Add noninteractive configuration key

ocaml/lib/parsers/config/lexer.ml

@@ -30,6 +30,7 @@ let string_of_token (token: token): string =
     | Key k -> (match k with
         | SuCommand -> "[ KEY: su_command ]"
         | SuCommandQuoted -> "[ KEY: su_command_quoted ]"
+        | Interactive -> " [ KEY: interactive ]"
         | Unknown -> "[ UNKNOWN KEY ]")
     | Equal -> "[ OP: equal ]"
     | Value v -> "[ VAL: " ^ v ^ " ]"

ocaml/lib/parsers/config/parser.ml

@@ -38,6 +38,9 @@ let update config key (value: string): Schema.main =
     | SuCommandQuoted ->
         { config with
             Schema.su_command_quoted = parse_boolean key value }
+    | Interactive ->
+        { config with
+            Schema.interactive = bool_of_string value }
     | Unknown ->
         elog ~context:Parsing $ "[c.parser.update] Dropped value: unknown key";
         config