Correction due to changed cpio behavior

Correction due to changed cpio behavior

As part of a security fix for cpio, its behavior has changed in terms
of how symlinks are handled.

This is affecting the Fuel build process, for which this commit is a
fix (reverting cpio back to its original behavior by adding the
argument "--extract-over-symlinks" in those instances where this is
needed).

For details, see https://jira.opnfv.org/browse/FUEL-125

Change-Id: I455b11a16ad52d8dd09165165447e4c4a661b45a
Signed-off-by: Stefan K. Berg <stefan.k.berg@ericsson.com>