tree 7fc17c893d809d8dc2c488c9c07b45aedbcc6270
parent afc793e651d4592f035f8c136e4da3c39b4071ad
author Pavlin Radoslavov <pavlin@onlab.us> 1409102770 -0700
committer Saurav Das <sauravdas@alumni.stanford.edu> 1409942844 -0700

Remove the local onos/core/Pair.java class and replace it with
the corresponding "org.apache.commons.lang3.tuple.Pair" from Apache.

Usage differences:
 * "new Pair<>(a, b)" -> "Pair.of(a, b)"
    Note that "Pair.of()" returns immutable pair by definition: ImmutablePair

 * "Pair.getFirst()" -> "Pair.getLeft()"
   "Pair.getSecond()" -> "Pair.getRight()"

Also, few replacements for HashMap and similar containers:
"new HashMap<Foo, Bar>()" -> "new HashMap<>()"

Change-Id: I7a3d8a34dac37c672f0d1779f83f50dfeba8dec7