Add delete SSH key functionality

autohat should clean up adfter itself

change-type: patch

resources/resincli.robot

@@ -28,7 +28,11 @@ Add new SSH key with name "${key_name}"
         Log   all output: ${result.stdout}
         Run Process    balena key rm ${result.stdout} -y    shell=yes
     END
-    ${result} =  Run Process    cat /root/.ssh/id_ecdsa.pub | balena key add test    shell=yes    timeout=60sec
+    ${result} =  Run Process    cat /root/.ssh/id_ecdsa.pub | balena key add "${key_name}"    shell=yes    timeout=60sec
+    Process ${result}
+
+Delete SSH key with name "${key_name}"
+    ${result} =  Run Process    balena key rm ${key_name} --yes    shell=yes
     Process ${result}
 
 Create application "${application_name}" with device type "${device}"