Update and add notifiers in create volume

1. Change status from 'creating' to 'available' when the volume is created
2. Add a notifier when it fails to create the volume

Implements: notifiers for create volume
Fixes: bug #1190754
Change-Id: I3a7d118630b32cfa7efb6bc8984418ca9836764a
Merge "Update and add notifiers in create volume"