Creates /etc/landscape/client.confr on upgrade

After upgrading to landscape-client 13.02+bzr620-0ubuntu0~precise1, I
was left with a bogus /etc/landscape/client.confr file.

The problem appears to be this line in landscape-client.config:

| sed -ir 's/^registration_password[[:blank:]]*=/registration_key =/' $CONFIGFILE

| root@keule:/tmp# mkdir test; cd test/
| root@keule:/tmp/test# cp /etc/landscape/client.conf . -iv
| `/etc/landscape/client.conf' -> `./client.conf'
| root@keule:/tmp/test# sed -ir 's/^registration_password[[:blank:]]*=/registration_key =/' client.conf
| root@keule:/tmp/test# ls -l
| total 8
| -rw------- 1 root root 650 Feb 21 19:09 client.conf
| -rw------- 1 root root 650 Feb 21 19:09 client.confr
| root@keule:/tmp/test#