bugfix: Add policycoreutils-python as Kimchi dependency

policycoreutils-python is needed in order to run semanage, otherwise we
will get the following error while installing kimchi package:

/sbin/semanage: compilation failed: make:
/usr/share/selinux/default/Makefile: No such file or directory make: ***
No rule to make target `/usr/share/selinux/default/Makefile'.  Stop.

Signed-off-by: Aline Manera <alinefm@br.ibm.com>
Update Changelog and po files for 1.2.1 release

Run "make dist" to update those files for 1.2.1 release.

Signed-off-by: Aline Manera <alinefm@br.ibm.com>