REORG: check: move the e-mail alerting code to mailers.c
check.c is one of the largest file and contains too many things. The
e-mail alerting code is stored there while nothing is in mailers.c.
Let's move this code out. That's only 4% of the code but a good start.
In order to do so, a few tcp-check functions had to be exported.
diff --git a/src/server.c b/src/server.c
index 0d9b533..b2c2853 100644
--- a/src/server.c
+++ b/src/server.c
@@ -27,6 +27,7 @@
#include <haproxy/dns.h>
#include <haproxy/errors.h>
#include <haproxy/global.h>
+#include <haproxy/mailers.h>
#include <haproxy/namespace.h>
#include <haproxy/queue.h>
#include <haproxy/sample.h>