Small fix

Library    REST    ${VNFM_SCHEMA}://${VNFM_HOST}:${VNFM_PORT}

Documentation  

...    Preconditions:

...    ...    Subscription to LCM operations.

...    ...    The notification enpoint will be condifured on http://localhost:8888/subscribe

...    ...    Mock server's jar should be locally present on the same directory when the test will run

...    ...    The notification endpoint will be configured on http://localhost:8888/subscribe

...    ...    Subscription to LCM operations previously performed using as callback_URI: http://localhost:8888/subscribe.

*** Test Cases ***