libnm/vpn: lookup nm_vpn_plugin_info_supports_multiple() from cached values

Instead of looking into the keyfile, lookup the "supports-multiple-connections" setting
in the "keys" hash. This has some behavioral difference:

  - g_key_file_get_boolean() first does g_key_file_get_value(), and then
    converts the string using the private g_key_file_parse_value_as_boolean()
    function -- which is case-sensitive, accepts "true|false|0|1" and
    considers only the text until the first whitespace.

  - now, we put g_key_file_get_string() into the cache "keys" and
    parse it with _nm_utils_ascii_str_to_bool(). The latter is
    case insensitive, allows also "yes|no|on|off", strips whitespaces.

However, the difference is subtle and shouldn't matter.

The point of this change is to free "keyfile" after construction.

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