rgw: allocate enough space for bucket instance id

Fixes: #8608
Backport: dumpling, firefly
Bucket instance id is a concatenation of zone name, rados instance id,
and a running counter. We need to allocate enough space to account zone
name length.

Signed-off-by: Yehuda Sadeh <yehuda@inktank.com>
(cherry picked from commit 0016eed01fbe48603c7d6b976c26f031dc31b37a)