Update the LDAP connection handler so that the size units for the max request
size configuration attribute are consistent with the size units used in various
configuration attributes for the JE backend.  In particular, the following are
now true:

- KB refers to kilobytes, or 1000 bytes
- KiB refers to kibibytes, or 1024 bytes
- MB refers to megabytes, or 1000000 bytes
- MiB refers to mebibytes, or 1048576 bytes

Previously, only KB and MB were defined and they used the "power of 2" form
rather than the "power of 10" form.