Edit:

~/.juju/environments.yaml

and add:

openstack:
  type: openstack
  # Specifies whether the use of a floating IP address is required to give the nodes
  # a public IP address. Some installations assign public IP addresses by default without
  # requiring a floating IP address.
  use-floating-ip: true
  admin-secret: d69aa1133fcf83aa41c2648e5f857ffd
  # Globally unique swift bucket name
  control-bucket: juju-09c98b2249a0e5021afaa076916c112d
  public-bucket-uri: http://192.168.100.157:8080/v1/AUTH_582f72ff57af4b24b723c0abc1805493
  # If set, tools-url specifies from where tools are fetched.
  # tools-url:  https://you-tools-url
  # Usually set via the env variable OS_AUTH_URL, but can be specified here
  # auth-url: https://yourkeystoneurl:443/v2.0/
  # override if your workstation is running a different series to which you are deploying
  default-series: precise
  # The following are used for userpass authentication (the default)
  auth-mode: userpass
  # Usually set via the env variable OS_USERNAME, but can be specified here
  username: admin
  # Usually set via the env variable OS_PASSWORD, but can be specified here
  password: admin
  # Usually set via the env variable OS_TENANT_NAME, but can be specified here
  # tenant-name: <your tenant name>
  # Usually set via the env variable OS_REGION_NAME, but can be specified here
  region: RegionOne
  network: private