Resolves volume resize issue

Reasons:
- Cinder APIs are not able to complete the detach/attach properly with
  nova instance.
- resize2fs is not proceeding with e2fsck having "-f" and "-n" options.

Changes:
- Used nova-volume attach-detach APIs instead of cinder APIs.
- Updated e2fsck to use -p option to complete the e2fsck action so that
  resize2fs could proceed.
- Updated tests as per replaced Nova APIs instead of Cinder APIs.

Change-Id: I40f1dc8ca04b3bfcc4eae910515fcedf922c1a9e
Closes-Bug: #1291896
Merge "Resolves volume resize issue"