Log resource limits in kiB, MiB, GiB (as those are the limits we and other tools actually use)

[dcorbacho]

When we do conversions to MB inside vm_memory_monitor we use 1 MiB (1048576 bytes), as in the log messages. But when we convert values such as the high watermark, we use 1MB (1000000 bytes).

Detected while testing #1224

[michaelklishin]

It should be noted that /proc/meminfo actually reports values in mebibytes/kibibytes according to RHEL documentation.

Therefore the use of each value should be analysed on a case by case basis.