Add IBMNAS driver configuration flags

- Add support for IBMNAS volume driver configuration flags.
(nfs_shares_config, nfs_sparsed_volumes, nfs_mount_point_base
nas_ip, nas_login, nas_password)
- Add initialization of nfs_mount_point_base directory,
nfs_shares_config with proper owner and permission settings.
- Updated README.md with ibmnas attributes

Change-Id: I88607740963916ccc26daee5873cca532b00a434
Implements: blueprint ibmnas-chef-support
allow specifying bind port

Much like a previous commit to allow specifying a bind IP for the API
service (3a576ac), this commit adds a similar ability to specify a bind port.

Change-Id: I62caf397995fbcf3a202992b353c05cc027d07b6
Merge "allow specifying bind port"
Remove policy json file

Remove the policy.json template, as they contain no templated variables.
This would allow use of the policy.json files provided via the package,
and decrease the need to sync them with upstream

Change-Id: I4b76b948b6a08502f15c5289f5c0503d24382006
Implements: blueprint remove-policy-templates
Update Storewize/SVC driver name

The Storewize/SVC driver name changed as a result of change
I1696a97279efe834a96b3f3843bc65f0ea6da9cc. This patch simply updates the
name.

Change-Id: I4d2aa3d828b9f61f237dbf12c2e199e57f3f06f7
Closes-Bug: #1311200