This patch resolves an issue where ProxySQL could not
bind due to incorrectly formatted IPv6 addresses in the
`mysql_ifaces` configuration. The kolla's
`put_address_in_context` filter is now used, ensuring
the addresses are properly enclosed in square brackets
for correct binding.

Closes-Bug: #2081106
Change-Id: Ic166b8d9a500023c8d23ec9fee03b28b268b26e7