Comment 99 for bug 1649707

Reviewed: https://review.opencontrail.org/33600
Committed: http://github.com/Juniper/contrail-controller/commit/c224c27a44e551d3489b5b11c038e73ec4cf4d43
Submitter: Zuul (<email address hidden>)
Branch: R3.2

commit c224c27a44e551d3489b5b11c038e73ec4cf4d43
Author: srinivn <email address hidden>
Date: Thu Jul 13 03:51:12 2017 -0700

Support single-active BGPaaS object attached to multiple VMIs

Existing way to derive the extended ports are changed as follows,
- Port range which will be used by bgpaas will be defined as part of global
system config in schema.
- From the given range, the dervied port will be defined as follows,
Ex : 50000 - 50512
Session:1 : config allocates :50000 for VMI1
Sharing the session-1 for VMI2: allocates 50513
Sharing the session-1 for VMI3: allocates 51026
Session:2 : config allocates : 50001 for VMI4
Sharing the session-2 for VMI5: allocates 50514
Sharing the session-2 for VMI6: allocates 51027
- introduced infra to process global_system config and update bgpaas parameters

Change-Id: Ifb552f57c9ec5b1f4cf702abbf708d67be8bc723
Closes-Bug: #1649707