FIX Missing v1 prefix for some standard operations

V1 prefixes missing in some operations.
There are urls in the doc that are not here (https://github.com/telefonicaid/fiware-orion-pep/tree/develop#standard-operations):

# suscribe-availability
- updateContextAvailabilitySubscription
- unsubscribeContextAvailability


# subscribe
- updateContextSubscription
- unsubscribeContext