update links in README file
update links in README file

1. What is the problem
Tricircle directory doc/source has been refactored, some links in README
are disabled.

2. What is the solution for the problem
Update the links in README file to the latest.

3. What the features need to be implemented to the Tricircle to
realize the solution
None.

Change-Id: I1f94d0c6349b6e679214e6b0b1b4773d030abe17

stackforge/tricircle,stackforge/tricircle,openstack/tricircle,openstack/tricircle