- Bump version: 9.11.16 → 9.11.17

- Delete atftp from SLE15 boot descriptions

atftp will not be part of SLE15 per fate#323633.
This Fixes #543

- Fixed blocksize setup in losetup

The -L option was used to set the blocksize value for losetup
However there is an option name clash between suse util-linux
and upstream which now leads to the problem that option -L
has changed its meaning and actually means --nooverlap which
completely breaks the call in kiwi. This patch changes the
call to use the long form --logical-blocksize.
This Fixes bsc#1066873

- Code cleaning and enhancing variables names

- Use usr/lib/rpm if present instead of var/lib/rpm

With this commit OEM recovery tries to backup usr/lib/rpm if present,