Update list of oslo libs in update.py

We have to track the list of oslo libs so we do not rewrite references
to them when syncing modules from the incubator. This change moves the
list to a variable and adds several of the missing libraries.

Change-Id: I493c09f285da9360a527109c14be2ff22f70b543
Mark jsonutils as obsolete

jsonutils has moved to oslo.serialization, so mark it obsolete in the
incubator.

Change-Id: I6b9a661dc6ff082267c0ebed0fe99f9790befc4c
Use file locks by default again

Backport of f1688a70f28a15cb864651f534344faab92c0d1f from
oslo.concurrency.

Closes-Bug: 1327946

Change-Id: Ia64eee85901f5ff2717f5ea24ecb039151a5ffb9
Merge "Update list of oslo libs in update.py"
Merge "Mark jsonutils as obsolete"
Merge "Use file locks by default again"