Python 3: replace "im_self" by "__self__"

The Python 3 removed the "im_self" attribute and only supports the
"__self__". This patch replaces "im_self" by "__self__" attribute.

Closes-Bug: #1282514
Change-Id: Ib017fff4b720a5dd7ee27fd01b36a531d9b6ca9c
Restrict rootwrap find filter for NetAppNFS driver

Additional make the name of the filter unique, so it does not override
any other rule. Like the find rule of the GPFS driver.
Rootwrap is making use of plain python ConfigParser which handles INI files
with key=value pair like fashion. Where the key is unique.

Closes-Bug: 1250101

Change-Id: Id2f193485089e12f00008b38fad2b95a09674ff2
Fix volume stats with multiple LeftHand clusters

When more than one cluster exists in a LeftHand management
group, get_volume_stats may return the stats for the wrong
cluster. This patch fixes the problem by listing the cluster
name in the getClusterInfo query.

Change-Id: I2d5a76869c6bb1b3d514f0546ea00998e5ee32fb
Closes-Bug: #1279897
Merge "Fix volume stats with multiple LeftHand clusters"
Merge "Restrict rootwrap find filter for NetAppNFS driver"
Merge "Python 3: replace "im_self" by "__self__""