MINOR: server: Add a dictionary for server names.

This patch only declares and defines a dictionary for the server
names (stored as ->id member field).
diff --git a/include/types/server.h b/include/types/server.h
index 574d40e..4a07726 100644
--- a/include/types/server.h
+++ b/include/types/server.h
@@ -175,6 +175,9 @@
 #define SRV_SSL_O_EARLY_DATA   0x400  /* Allow using early data */
 #endif
 
+/* The server names dictionary */
+extern struct dict server_name_dict;
+
 struct pid_list {
 	struct list list;
 	pid_t pid;
diff --git a/src/server.c b/src/server.c
index 97cc5e0..bec498c 100644
--- a/src/server.c
+++ b/src/server.c
@@ -25,6 +25,7 @@
 
 #include <types/applet.h>
 #include <types/cli.h>
+#include <types/dict.h>
 #include <types/global.h>
 #include <types/cli.h>
 #include <types/dns.h>
@@ -62,6 +63,12 @@
 struct task *idle_conn_cleanup[MAX_THREADS] = { NULL };
 struct list toremove_connections[MAX_THREADS];
 
+/* The server names dictionary */
+struct dict server_name_dict = {
+	.name = "server names",
+	.values = EB_ROOT_UNIQUE,
+};
+
 int srv_downtime(const struct server *s)
 {
 	if ((s->cur_state != SRV_ST_STOPPED) && s->last_change < now.tv_sec)		// ignore negative time