Accept trailing /'s on URLs.

The API should accept trailing slashes.  The werkzeug map rule strict
slashes is set to False to allow trailing slashes.  The tests have
been updated using mock methods to verify that the api accepts the
call and then calls central service.
Fixes: bug 1202411
Change-Id: Iedf9d60b24cd835f3f628b90993ca125faa9389b