package/haproxy: security bump to version 2.0.10

package/haproxy: security bump to version 2.0.10

Fixes the following security vulnerabilities:

- CVE-2019-19330: The HTTP/2 implementation in HAProxy before 2.0.10
  mishandles headers, as demonstrated by carriage return (CR, ASCII 0xd),
  line feed (LF, ASCII 0xa), and the zero character (NUL, ASCII 0x0), aka
  Intermediary Encapsulation Attacks.

In addition, 2.0.6..10 fixes a number of bugs.  See the changelog for
details:

https://www.haproxy.org/download/2.0/src/CHANGELOG

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>