Add Validation logging.

Persist the last 20 lines of validation info for the last 10
networks.

bug: 21599856
Change-Id: I8124480cc9181eea2adb7eb6eabcd07c9506b6d3
1 file changed
tree: a202f3dce1b721e33f30b5f5ebabfff548967d89
  1. core/
  2. services/
  3. tests/