- Bump version: 9.17.6 → 9.17.7

- Fix use of SysConfig objects

objects of that class did not provide a get method but
overload the bracket [] operator. Using the get() method
failed. This Fixes #910

- Use chkstat to verify and fix file permissions

Call chkstat in system mode which reads /etc/sysconfig/security
to determine the configured security level and applies the
appropriate permission definitions from the /etc/permissions*
files. It's possible to provide those files as overlay files
in the image description to apply a certain permission setup
when needed. Otherwise the default setup as provided on the
package level applies. It's required that the image root system
has chkstat installed. If not present KIWI skips this step
and continuous with a warning. This Fixes #895

- Allow setting the protocol for exposed ports

With this commit it is possible to set tcp or upd (e.g. "80/tcp") for
exposed container ports. If no protocol is provided OCI defaults are