rust: Fix deprecation warnings

Fix the following warnings by compiler,
(1) warning: use of deprecated item 'take_until_s': Please use `take_until` instead
(2) warning: `...` range patterns are deprecated

For the second warning, the builtin lint
"ellipsis_inclusive_range_pattern" has been added which causes the
following warning to show up with rustc 1.24.

warning: unknown lint: `ellipsis_inclusive_range_patterns`
  --> /home/travis/build/OISF/suricata/suricata-5.0.0-dev/rust/src/lib.rs:18:10
   |
18 | #![allow(ellipsis_inclusive_range_patterns)]
   |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: #[warn(unknown_lints)] on by default

Since there is no other way to fix this, the above warning shall stay.
We need to take care of modifying this if and when the support for 1.24
as MSRV is dropped.

rust/src/applayertemplate/parser.rs

@@ -24,7 +24,7 @@ fn parse_len(input: &str) -> Result<u32, std::num::ParseIntError> {
 named!(pub parse_message<String>,
        do_parse!(
            len:  map_res!(
-                 map_res!(take_until_s!(":"), std::str::from_utf8), parse_len) >>
+                 map_res!(take_until!(":"), std::str::from_utf8), parse_len) >>
            _sep: take!(1) >>
            msg:  take_str!(len) >>
                (

rust/src/lib.rs

@@ -15,6 +15,7 @@
  * 02110-1301, USA.
  */
 
+#![allow(ellipsis_inclusive_range_patterns)] // TODO: Remove when MSRV is higher than 1.24
 #![cfg_attr(feature = "strict", deny(warnings))]
 
 #[macro_use]