disk/api.py: resize2fs needs tests + better log

[Sahid Orentino]

In disk/api.py the method resize2fs does not have a test.

Also, the method firstly use e2fsck to check if the filesystem is correct. if the program failed no information was logged and the actual algorithm try to do the resize anyway. Same with e2fsck, if resize2fs failed not information are logged.

We need to add tests for this function and log every error returned.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/67412

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/67412
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=da84cb078e9820c7c9d64bdccd904e1b257ab96e
Submitter: Jenkins
Branch: master

commit da84cb078e9820c7c9d64bdccd904e1b257ab96e
Author: Sahid Orentino Ferdjaoui <email address hidden>
Date: Fri Jan 17 11:09:34 2014 +0100

    disk/api.py: resize2fs fails silently + adds tests

    + The method disk.api.resize2fs fails silently and should
      writes some information in the log.
    + Adds missing tests to disk.api.resize2fs

    Change-Id: I4edd88fb85a73c75628958e3f2ea668c0d3cad89
    Closes-Bug: #1270088