MEDIUM: stream: move HTTP request body analyser before process_common

Since 1.5, the request body analyser has become independant from any
other element and does not even disturb the message forwarder anymore.
And since it's disabled by default, we can place it before most
analysers so that it's can preempt any other one if an intermediary
one enables it.
diff --git a/include/types/channel.h b/include/types/channel.h
index 12ab280..e95c462 100644
--- a/include/types/channel.h
+++ b/include/types/channel.h
@@ -136,14 +136,14 @@
 /* unused: 0x00000001 */
 #define AN_REQ_INSPECT_FE       0x00000002  /* inspect request contents in the frontend */
 #define AN_REQ_WAIT_HTTP        0x00000004  /* wait for an HTTP request */
-#define AN_REQ_HTTP_PROCESS_FE  0x00000008  /* process the frontend's HTTP part */
-#define AN_REQ_SWITCHING_RULES  0x00000010  /* apply the switching rules */
-#define AN_REQ_INSPECT_BE       0x00000020  /* inspect request contents in the backend */
-#define AN_REQ_HTTP_PROCESS_BE  0x00000040  /* process the backend's HTTP part */
-#define AN_REQ_SRV_RULES        0x00000080  /* use-server rules */
-#define AN_REQ_HTTP_INNER       0x00000100  /* inner processing of HTTP request */
-#define AN_REQ_HTTP_TARPIT      0x00000200  /* wait for end of HTTP tarpit */
-#define AN_REQ_HTTP_BODY        0x00000400  /* inspect HTTP request body */
+#define AN_REQ_HTTP_BODY        0x00000008  /* wait for HTTP request body */
+#define AN_REQ_HTTP_PROCESS_FE  0x00000010  /* process the frontend's HTTP part */
+#define AN_REQ_SWITCHING_RULES  0x00000020  /* apply the switching rules */
+#define AN_REQ_INSPECT_BE       0x00000040  /* inspect request contents in the backend */
+#define AN_REQ_HTTP_PROCESS_BE  0x00000080  /* process the backend's HTTP part */
+#define AN_REQ_SRV_RULES        0x00000100  /* use-server rules */
+#define AN_REQ_HTTP_INNER       0x00000200  /* inner processing of HTTP request */
+#define AN_REQ_HTTP_TARPIT      0x00000400  /* wait for end of HTTP tarpit */
 #define AN_REQ_STICKING_RULES   0x00000800  /* table persistence matching */
 #define AN_REQ_PRST_RDP_COOKIE  0x00001000  /* persistence on rdp cookie */
 #define AN_REQ_HTTP_XFER_BODY   0x00002000  /* forward request body */