MINOR: server: Add 'server-template' new keyword supported in backend sections.

This patch makes backend sections support 'server-template' new keyword.
Such 'server-template' objects are parsed similarly to a 'server' object
by parse_server() function, but its first arguments are as follows:
    server-template <ID prefix> <nb | range> <ip | fqdn>:<port> ...

The remaining arguments are the same as for 'server' lines.

With such server template declarations, servers may be allocated with IDs
built from <ID prefix> and <nb | range> arguments.

For instance declaring:
    server-template foo 1-5 google.com:80 ...
or
    server-template foo 5 google.com:80 ...

would be equivalent to declare:
    server foo1 google.com:80 ...
    server foo2 google.com:80 ...
    server foo3 google.com:80 ...
    server foo4 google.com:80 ...
    server foo5 google.com:80 ...
diff --git a/include/types/server.h b/include/types/server.h
index bfaa941..8d68dcb 100644
--- a/include/types/server.h
+++ b/include/types/server.h
@@ -274,6 +274,15 @@
 		int line;			/* line where the section appears */
 		struct eb32_node id;		/* place in the tree of used IDs */
 	} conf;					/* config information */
+	/* Template information used only for server objects which
+	 * serve as template filled at parsing time and used during
+	 * server allocations from server templates.
+	 */
+	struct {
+		char *prefix;
+		int nb_low;
+		int nb_high;
+	} tmpl_info;
 };
 
 /* Descriptor for a "server" keyword. The ->parse() function returns 0 in case of