Take down edge ports on a leaf switch when all uplinks are gone

- Bug fix for case when all uplinks are gone, but dual-homed host continues to send packets to switch;
  We now administratively take down the host port to force the host to use the other leaf in the pair.
- Restructured SR manager by creating a LinkHandler
- fixed/added some log messages

Change-Id: I3722cd364dc8798b16891519bec165627e92bd87
8 files changed
tree: 644ddbbe5b965b7ed77b10b6472fb125bc798a04
  1. BUCK
  2. app.xml
  3. features.xml
  4. pom.xml
  5. src/