Patched some existing and added IPFIX to Postman API Collection.

Changes:
-------
Added:
IPFIX API Calls:

Modified/Patched:
SFlow
Queue
NetFlow
Controller
Manager

For version tracking I opened Bugzilla ID 667
https://bugs.opendaylight.org/show_bug.cgi?id=667

Change-Id: I3ccdf12463b25f766254c3fa0058753584caf3b5
Signed-off-by: Brent Salisbury <brent.salisbury@gmail.com>