edit-node: check for dracut.conf before attempting to read contents

Change-Id: I2fb13dcfc5059fc51bd18a35e6610d6412d1716f
Bug-Url:https://bugzilla.redhat.com/show_bug.cgi?id=1109350
Signed-off-by: Joey Boggs <jboggs@redhat.com>
edit-node:miss to set a public key for the "root" user

Change-Id: Ia4443cb9823334bc901ace8725494fb5f00dc20d
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1108536
Signed-off-by: hadong <hadong@redhat.com>