Update rootwrap with code from oslo

Partial-Bug: #1268674

Change-Id: I3dd2c4cab6652dea5bd755b6048cbeea9edc81cf
Add missing "Filters" section to the ironic-images.filters

The ironic-images.filters file is missing the [Filters] section. This
will cause the ironic-rootwrap command to fail.

Change-Id: I3780fc89e0144093a40035e6b91fcf946bbdf6a3
Partial-Bug: #1268674
Remove the absolute paths from ironic-deploy-helper.filters

The commands might be located in a different directories on different
distros, so this patch is removing the absolute paths in the
ironic-deploy-helper.filters file.

Change-Id: I68873a04acbf1519165f758b1803f12ba9ddf777
Closes-Bug: #1268696