홍길동 / onos

Ported the following IP address classes from the older codebase:
Ip4Address, Ip6Address, Ip4Prefix, Ip6Prefix (and the corresponding
unit tests).
NOTE: Those classes are not ready to be used yet.

Change-Id: I234875abbc9df8daa2f8ae28706af591dd2c5f2d

 * Moved unit test utilities to the onlab-junit package under utils/junit
   - ImmutableClassChecker
   - TestUtils and TestUtilsTest

 * Added/ported unit test utilities from the older code
   - UtilityClassChecker and UtilityClassCheckerTest
   - ImmutableClassCheckerTest

 * Updated/fixed some of the pom.xml files in the context of the
   onlab-junit package:
   - Added <scope>test</scope>
   - Replaced hard-coded "1.0.0-SNAPSHOT" with "${project.version}"

Change-Id: Ie5f51ba401ca1748340f38848ab6bfc251964adc

- Added (placeholder) logo to mast head.
- Minor tweaks.

 plus refactor a unit test that started failing

Change-Id: Ib9f0f8eefc2ba7a9798d8f01b537dae18dd2920c

Change-Id: I72d89d878e1fae95d1e16d9ed473b7711895e478

Change-Id: Ie9b02e2d199aa72f9828e91b248bd052f7b38fa2

Change-Id: Ibbad495b45f2d461eced6cae2a221887466a83c2

Change-Id: I373a942697624440e025a8022a13394396058a71

Change-Id: Ic6ab6237237b2a5019851182b2869110bc5b1b73

- Added hosts to test data.
- Messed with colors and icons.
- Added more internal configuration values.

Change-Id: I4f2dacb52739dbbbdbcbc59916998bd161fe3fe8

Change-Id: I8cef7ae7fff3c9423daad242630a69922b855e98

 * Use the new class EventMetric to cleanup and simplify the implementation
 * Replaced the single metric for Topology Events with four metrics
   (last event timestamp and event rate):
   - Device Event metrics
   - Host Event metrics
   - Link Event metrics
   - Topology Graph metrics

Change-Id: I2acc06ab84ef3ca06d0d383983dfcff9774ff341