2.1-SR Multi Cast

commit 9a1e6a548b5ee41ca42f4fe420a144f0fe9f94d1 (HEAD -] onos-2.1, origin/onos-2.1)
Author: Jordan Halterman [jordan.halterman@gmail.com]
AuthorDate: Tue Apr 23 10:39:03 2019 -0700
Commit: Thomas Vachuska [tom@opennetworking.org]
CommitDate: Tue Apr 30 22:52:23 2019 +0000

Pre-allocate sliding window counter slots to avoid thread safety issues.
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(cherry picked from commit d884d8acf99c10b5c5885a3e8328187ae2550106)

Case 1: Create a Multicast flow between a source and sink on the same dual-tor leaf - FAIL