virtual_memory() on NetBSD

[khanzf]

virtual_memory() opened the /proc/meminfo file as a binary. As such, each line was a binary, but lines 135 and 137 were checking against a string type. This caused str.startswith() to raise a TypeError and fail.

[giampaolo]

Please add something like "#XXX [NetBSD]: virtual_memory() raises TypeError on Python 3." in HISTORY.rst

[khanzf]

This item was resolved with commit e98db38. Closing ticket.