Sync apiclient from oslo-incubator

Need to sync the latest apiclient from oslo-incubator to make nova
cli cache work. Command used:
python update.py --base novaclient --dest-dir ../python-novaclient/ \
--modules apiclient

syncd patches:

apiclient:
  * 12341ef504 Merge "Restore UUID and human-ID bash completion"
  * 468afcb335 Merge "Don't slugify names that don't exist"

Change-Id: Iec2ad851b47628c5dde4272f438cce4150e11912
Close-bug: 1337033
Merge "Sync apiclient from oslo-incubator"