Sync oslo logging

Sync changes to oslo/common/log.py:
  27b21bc95275a994c750c3f6bb145f4d0179cb55
  13eb01c6e41be550fead5d2ceff56679921bd579
  fe18bfa4c19d6a18cf922a40af37b327b68e3aed
  6d0a6c3083218cdac52758a8b6aac6b03402c658
  8b2b0b743e84ceed7841cf470afed6a5da8e1d07
  71208fe2ac0d38146166a94ecec948d1830a4eeb
  0228b81e670c6690da1083f19285cd86c26bbc8f
  d292f7d8b0d20a29829d37aab158b38028f010c6
  bcf6d5e6258095e17a324b3eeef8a1dc5fa5b260
  55cd46af7b533f1d1726d8d90b0213ca561eb42a
  79e8a9a08daf563aa8a8d9280c9a6a27dcafc8f2
  1978114030c275c571a1786644a5e0d51ada29c0
  52b64466177b58c8e80bc72c5ce1e940782c969a
  dda47c9cef19c5d8f050cf5081535b4061024457
  61ff7a66fef51ba2a783a5ed87e14256a6e9432c
  86707cd5c01a2de6b9ba386d7ea4f72c9c7286b1
  346884d48c88e1b2d550e8cef878e604c39bf10d
  0d1838132ffb1d23cf997575fdc64f3ff7f25221
  da6d713787adf4ec6f2d963c42ebe8d1a1517108

Also sync minor logging changes to:
  openstack/common/fileutils.py
  openstack/common/loopingcall.py

Change-Id: Ibac23bd7259579d6866acf6909313f9ca20976d1
Merge "Sync oslo logging"