Added the ServiceContextMock implementation

This is useful to debug a standalone script that is a part of a recipe in the IDE with no cloudify deployment
It's activated by adding -Dlocal.debug=true to the debug configuration.
The user can also set all the different properties that he expects by using system properties eg. (-D.local.debug.instanceId=5).
attributes should also work

not working:
-storage facade
-wait for another instance