MINOR: http: add the function "del-header" to the directives http-request and http-response

This patch permits to remove all HTTP request and response header fields
whose name is specified in <name>.
diff --git a/doc/configuration.txt b/doc/configuration.txt
index 6d6f45e..65df417 100644
--- a/doc/configuration.txt
+++ b/doc/configuration.txt
@@ -2847,8 +2847,8 @@
 
 http-request { allow | deny | tarpit | auth [realm <realm>] | redirect <rule> |
               add-header <name> <fmt> | set-header <name> <fmt> |
-              set-nice <nice> | set-log-level <level> | set-tos <tos> |
-              set-mark <mark> }
+              del-header <name> | set-nice <nice> | set-log-level <level> |
+              set-tos <tos> | set-mark <mark> }
              [ { if | unless } <condition> ]
   Access control for Layer 7 requests
 
@@ -2907,6 +2907,9 @@
       information to the server, where the header must not be manipulated by
       external users.
 
+    - "del-header" removes all HTTP header fields whose name is specified in
+      <name>.
+
     - "set-nice" sets the "nice" factor of the current request being processed.
       It only has effect against the other requests being processed at the same
       time. The default value is 0, unless altered by the "nice" setting on the
@@ -2977,8 +2980,8 @@
              about ACL usage.
 
 http-response { allow | deny | add-header <name> <fmt> | set-nice <nice> |
-                set-header <name> <fmt> | set-log-level <level> |
-                set-mark <mark> | set-tos <tos> }
+                set-header <name> <fmt> | del-header <name> |
+                set-log-level <level> | set-mark <mark> | set-tos <tos> }
               [ { if | unless } <condition> ]
   Access control for Layer 7 responses
 
@@ -3014,6 +3017,9 @@
       information to the server, where the header must not be manipulated by
       external users.
 
+    - "del-header" removes all HTTP header fields whose name is specified in
+      <name>.
+
     - "set-nice" sets the "nice" factor of the current request being processed.
       It only has effect against the other requests being processed at the same
       time. The default value is 0, unless altered by the "nice" setting on the