[DCCP]: Introduce a consistent naming scheme for sysctls

In order to make their function clearer and obtain a consistent naming
scheme to identify sysctls, all existing DCCP sysctls have been prefixed
with `sysctl_dccp', following the same convention as used by TCP.

Feature-specific sysctls retain the `feat' in the middle, although the
`default' has been dropped, since it is obvious from use.

Also removed a duplicate `dccp_feat_default_sequence_window' in ipv4.c.

Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
diff --git a/net/dccp/dccp.h b/net/dccp/dccp.h
index e7b96074..363fa52 100644
--- a/net/dccp/dccp.h
+++ b/net/dccp/dccp.h
@@ -68,12 +68,12 @@
 extern int  sysctl_dccp_request_retries;
 extern int  sysctl_dccp_retries1;
 extern int  sysctl_dccp_retries2;
-extern int  dccp_feat_default_sequence_window;
-extern int  dccp_feat_default_rx_ccid;
-extern int  dccp_feat_default_tx_ccid;
-extern int  dccp_feat_default_ack_ratio;
-extern int  dccp_feat_default_send_ack_vector;
-extern int  dccp_feat_default_send_ndp_count;
+extern int  sysctl_dccp_feat_sequence_window;
+extern int  sysctl_dccp_feat_rx_ccid;
+extern int  sysctl_dccp_feat_tx_ccid;
+extern int  sysctl_dccp_feat_ack_ratio;
+extern int  sysctl_dccp_feat_send_ack_vector;
+extern int  sysctl_dccp_feat_send_ndp_count;
 
 /* is seq1 < seq2 ? */
 static inline int before48(const u64 seq1, const u64 seq2)