found some bugs

Alexandre, please consider merging this.
Github user https://github.com/SaveTheRbtz found some bugs here: https://github.com/acassen/keepalived/commit/448573581b1feb9f959057c93c8b396bd45c35ab

One of them is really painful: forgot to pass a parameter to log_message in check_http.c:epilog.
This should not lead to crashes in 1.2.13, but mess in a log could be very annoying. Sorry for that.