The 'domrename' command needs to check if the new domain name contains
the slash character. This character is not accepted by libvirt XML
definition because it is an invalid char (see Cole's commit b1fc6a7b).
This commit enhace the 'domrename' command adding this check.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1333232Signed-off-by: NJulio Faracco <jcfaracco@gmail.com>
Reviewed-by: NJohn Ferlan <jferlan@redhat.com>