[INET]: Just rename the TCP hashtable functions/structs to inet_

This is to break down the complexity of the series of patches,
making it very clear that this one just does:

1. renames tcp_ prefixed hashtable functions and data structures that
   were already mostly generic to inet_ to share it with DCCP and
   other INET transport protocols.

2. Removes not used functions (__tb_head & tb_head)

3. Removes some leftover prototypes in the headers (tcp_bucket_unlock &
   tcp_v4_build_header)

Next changesets will move tcp_sk(sk)->bind_hash to inet_sock so that we can
make functions such as tcp_inherit_port, __tcp_inherit_port, tcp_v4_get_port,
__tcp_put_port,  generic and get others like tcp_destroy_sock closer to generic
(tcp_orphan_count will go to sk->sk_prot to allow this).

Eventually most of these functions will be used passing the transport protocol
inet_hashinfo structure.

Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/tcp_diag.c b/net/ipv4/tcp_diag.c
index f79bd11..5bb6a0f 100644
--- a/net/ipv4/tcp_diag.c
+++ b/net/ipv4/tcp_diag.c
@@ -590,7 +590,7 @@
 		if (!(r->tcpdiag_states&(TCPF_LISTEN|TCPF_SYN_RECV)))
 			goto skip_listen_ht;
 		tcp_listen_lock();
-		for (i = s_i; i < TCP_LHTABLE_SIZE; i++) {
+		for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
 			struct sock *sk;
 			struct hlist_node *node;
 
@@ -646,7 +646,7 @@
 		return skb->len;
 
 	for (i = s_i; i < tcp_ehash_size; i++) {
-		struct tcp_ehash_bucket *head = &tcp_ehash[i];
+		struct inet_ehash_bucket *head = &tcp_ehash[i];
 		struct sock *sk;
 		struct hlist_node *node;