Bumping Undertow version to 2.0.*.
Bumping Undertow version to 2.0.*.

Security issues being fixed:
- A flaw was found in, all under 2.0.20, in the Undertow DEBUG log for io.undertow.request.security. If enabled, an attacker could abuse this flaw to obtain the user's credentials from the log files.
- undertow before version 2.0.23.Final is vulnerable to an information leak issue. Web apps may have their directory structures predicted through requests without trailing slashes via the api.

Kikaha has not directly interacted with Undertow features related to those security issues. Users who have been using default Kikaha configuration should not been vulnerable. On the other hand, due to the fact Kikaha allows Undertow users to use Undertow low-level API, users might still run into those security flaws. Therefore, this fix is considered important and we encourage all users to apply this patch as quick as possible.

Skullabs/kikaha,Skullabs/kikaha,Skullabs/kikaha,Skullabs/kikaha