server-info: stop using the_repository

Stop using `the_repository` in the "server-info" subsystem by passing in
a repository when updating server info and storing the repository in the
`update_info_ctx` structure to make it accessible to other functions.

Adjust callers accordingly by using `the_repository`. While there may be
some callers that have a repository available in their context, this
trivial conversion allows for easier verification and bubbles up the use
of `the_repository` by one level.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

server-info.h

@@ -1,7 +1,9 @@
 #ifndef SERVER_INFO_H
 #define SERVER_INFO_H
 
+struct repository;
+
 /* Dumb servers support */
-int update_server_info(int);
+int update_server_info(struct repository *r, int force);
 
 #endif /* SERVER_INFO_H */