[MINOR] add a weight divisor to the struct proxy

Under some circumstances, it will be useful to be able to have
a server's effective weight bigger than the user weight, and this
is particularly true for dynamic weight-based algorithms. In order
to support this, we add a "wdiv" member to the lbprm structure
which will always be used to divide the weights before reporting
them.
diff --git a/src/dumpstats.c b/src/dumpstats.c
index 2c91b43..cac57cf 100644
--- a/src/dumpstats.c
+++ b/src/dumpstats.c
@@ -756,7 +756,7 @@
 				     /* act, bck */
 				     "<td>%s</td><td>%s</td>"
 				     "",
-				     sv->uweight,
+				     sv->eweight * px->lbprm.wmult / px->lbprm.wdiv,
 				     (sv->state & SRV_BACKUP) ? "-" : "Y",
 				     (sv->state & SRV_BACKUP) ? "Y" : "-");
 
@@ -808,7 +808,7 @@
 				     /* weight, active, backup */
 				     "%d,%d,%d,"
 				     "",
-				     sv->uweight,
+				     sv->eweight * px->lbprm.wmult / px->lbprm.wdiv,
 				     (sv->state & SRV_BACKUP) ? 0 : 1,
 				     (sv->state & SRV_BACKUP) ? 1 : 0);
 
@@ -872,7 +872,7 @@
 				     px->retries, px->redispatches,
 				     human_time(now.tv_sec - px->last_change, 1),
 				     (px->lbprm.tot_weight > 0 || !px->srv) ? "UP" : "DOWN",
-				     px->lbprm.tot_weight * px->lbprm.wmult,
+				     px->lbprm.tot_weight * px->lbprm.wmult / px->lbprm.wdiv,
 				     px->srv_act, px->srv_bck);
 
 				chunk_printf(&msg, sizeof(trash),
@@ -918,7 +918,7 @@
 				     px->failed_conns, px->failed_resp,
 				     px->retries, px->redispatches,
 				     (px->lbprm.tot_weight > 0 || !px->srv) ? "UP" : "DOWN",
-				     px->lbprm.tot_weight * px->lbprm.wmult,
+				     px->lbprm.tot_weight * px->lbprm.wmult / px->lbprm.wdiv,
 				     px->srv_act, px->srv_bck,
 				     px->down_trans, now.tv_sec - px->last_change,
 				     px->srv?be_downtime(px):0,