Steps to change keystone endpoint:

keystone endpoint-list

And pick id of right one. Then delete it:

keystone endpoint-delete <id>

List services to find id of keystone service:

keystone service-list

Create new endpoint:

keystone endpoint-create                                                      \
         --region <region_name>                                               \
         --service-id <service_id>                                            \
         --publicurl "http://<keystone_host>:5000/v2.0"                       \
         --internalurl "http://<keystone_host>:5000/v2.0"                     \
         --adminurl "http://<keystone_host>:35357/v2.0"

Also you need to change new keystone endpoint in all configuration files used by other OpenStack services.

if you set the variable HOST_IP (in your localrc) to the IP address of your devstack node, you should be able to use your devstack deployment from remote locations:

HOST_IP=#your-ip#

You could also set the following variables like so:

SERVICE_HOST=$HOST_IP
IMAGE_HOST=$HOST_IP
IDENTITY_HOST=$HOST_IP

This will ensure that these services will use the same IP.