MINOR: server: read-lock the cookie during srv_set_dyncookie()

MINOR: server: read-lock the cookie during srv_set_dyncookie()

No need to use an exclusive lock on the proxy anymore when reading its
setting, a read lock is enough. A few other places continue to use a
write-lock when modifying simple flags only in order to let this
function see a consistent value all along. This might be changed in
the future using barriers and local copies.