REORG: ssl: move utility functions to src/ssl_utils.c

These functions are mainly used to extract information from
certificates.
diff --git a/src/ssl_sample.c b/src/ssl_sample.c
index 55eec78..f3fd0b4 100644
--- a/src/ssl_sample.c
+++ b/src/ssl_sample.c
@@ -32,6 +32,7 @@
 #include <proto/arg.h>
 #include <proto/obj_type.h>
 #include <proto/ssl_sock.h>
+#include <proto/ssl_utils.h>
 #include <proto/sample.h>