Change defaults to Ubuntu (#35)

README.md

@@ -40,7 +40,7 @@ docker-machine create -d otc --otc-cloud otc default
 
 **Machine with following setup will be started:**
 - **Flavor** `s2.large.2`
-- **Image** `Standard_Debian_10_latest`
+- **Image** `Standard_Ubuntu_18.04_latest`
 
 *Removing machine will remove all resources created on machine creation*
 
@@ -68,7 +68,7 @@ Flag | Env variable | Default value | Description
 `--otc-floating-ip`         | `OS_FLOATING_IP`          |                                       | Floating IP to use
 `--otc-floating-ip-type`    | `OS_FLOATING_IP_TYPE`     | 5_bgp                                 | Bandwidth type (either `5_bgp` or `5_mailbgp`)
 `--otc-image-id`            | `IMAGE_ID`                |                                       | Image id to use for the instance
-`--otc-image-name`          | `OS_IMAGE_NAME`           | Standard_Debian_10_latest             | Image name to use for the instance
+`--otc-image-name`          | `OS_IMAGE_NAME`           | Standard_Ubuntu_18.04_latest          | Image name to use for the instance
 `--otc-ip-version    `      | `OS_IP_VERSION`           | 4                                     | Version of IP address assigned for the machine (only 4 is supported by OTC for now)
 `--otc-k8s-group`           |                           |                                       | Create security group with k8s ports allowed
 `--otc-keypair-name`        | `OS_KEYPAIR_NAME`         |                                       | Key pair to use to SSH to the instance
@@ -83,7 +83,7 @@ Flag | Env variable | Default value | Description
 `--otc-skip-default-sg`     |                           |                                       | Don't create default security group
 `--otc-skip-ip`             |                           |                                       | If set, elastic IP won't be created, machine IP will be set to instance local IP
 `--otc-ssh-port`            | `OS_SSH_PORT`             | 22                                    | Machine SSH port
-`--otc-ssh-user`            | `SSH_USER`                | linux                                 | SSH user
+`--otc-ssh-user`            | `SSH_USER`                | ubuntu                                | SSH user
 `--otc-subnet-id`           | `SUBNET_ID`               |                                       | Subnet id the machine will be connected on
 `--otc-subnet-name`         | `SUBNET_NAME`             | subnet-docker-machine                 | Subnet name the machine will be connected on
 `--otc-token`               | `OS_TOKEN`                |                                       | Authorization token

driver/opentelekomcloud.go

@@ -42,8 +42,8 @@ const (
 	defaultSecurityGroup = "docker-machine-grp"
 	defaultAZ            = "eu-de-03"
 	defaultFlavor        = "s2.large.2"
-	defaultImage         = "Standard_Debian_10_latest"
-	defaultSSHUser       = "linux"
+	defaultImage         = "Standard_Ubuntu_18.04_latest"
+	defaultSSHUser       = "ubuntu"
 	defaultSSHPort       = 22
 	defaultRegion        = "eu-de"
 	defaultAuthURL       = "https://iam.eu-de.otc.t-systems.com/v3"