Rename net.{c,h} to net_sockets.{c,h}
The library/net.c and its corresponding include/mbedtls/net.h file are
renamed to library/net_sockets.c and include/mbedtls/net_sockets.h
respectively. This is to avoid naming collisions in projects which also
have files with the common name 'net'.
diff --git a/programs/x509/cert_app.c b/programs/x509/cert_app.c
index 73e853e..c893ca8 100644
--- a/programs/x509/cert_app.c
+++ b/programs/x509/cert_app.c
@@ -54,7 +54,7 @@
#include "mbedtls/entropy.h"
#include "mbedtls/ctr_drbg.h"
-#include "mbedtls/net.h"
+#include "mbedtls/net_sockets.h"
#include "mbedtls/ssl.h"
#include "mbedtls/x509.h"
#include "mbedtls/debug.h"