Refactored get_subscriptions() so that it uses a single call to the resource registry with read_mult instead of multiple calls
using datastore to make a single read_mult call with a list of ids. All tests working
Referencing the latest pyon in master
Merge branch 'master' into use_read_mult
using better log debug style
Using extend for lists instead of +=
Merge pull request #438 from swarbhanu/use_read_mult

Makes UNS more efficient by refactoring UNS methods in order to use the datastore once for a list of ids instead of multiple times