replaced have_innodb for innodb_buffer_pool_size because the former i…

[fipar]

…s no longer present on 5.7

[percona-csalguero]

LGTM, we just need to fix the conflicts

[svetasmirnova]

Actually looks like this issue is already fixed in the 3.x branch by using operator || and variable innodb_version:

   local have_innodb="$(get_var "have_innodb" "$dir/mysql-variables")"
   local innodb_version="$(get_var "innodb_version" "$dir/mysql-variables")"
   if [ "${have_innodb}" = "YES" ] || [ -n "${innodb_version}" ]; then 
...

[svetasmirnova]

Closed, because this issue is already resolved.