edit-node: support /etc/pki/entitlement to yum

Mount bind /etc/pki/entitlement.
Thanks to hadong <hadong AT redhat.com> for the initial patch suggestion.

Change-Id: I528b4939e6912c95f7d04cf7bcb283511e0bd982
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1136239
Signed-off-by: Douglas Schilling Landgraf <dougsland@redhat.com>