Something that comes up regularly on the mailing list is the topic
of leftover lock files from interprocess locks. An Oslo developer
then has to explain why they work the way they do, and this is a
not-inconsiderable time suck because it is a complex topic.
This change adds an administrator guide that explains what should
and should not be done with lock files, and provides an FAQ section
to (hopefully) pre-emptively answer many of the common questions
people ask.
Change-Id: I5442806ef2f107e3b7569a79bffdc344769545b0
f6bf926db7