Commit has two fixes:

1. Handle ASN update. Remove rtarget routes added with old asn and add with new asn. Added test case in both BGP server and Rtarget tests
2. Cherry pick from master
    commit 86b11e57667f3e2d36ba44cb19ba342721e88259
    Author: Prakash Bailkeri <prakashmb@juniper.net>
    Date:   Tue May 27 05:29:44 2014 -0700
    Handle the case where unsubsribe is rxed after client is already unsubscribed. Clear the registered routing instance list. Added testcase for duplicate unsubscribe and bulk a

    Change-Id: I078e957ca17c97aebbfff43cc2d579c8641b8674

Change-Id: Ifbba1386c90acf5f467418184fad559faa0709fd
Merge "Commit has two fixes:" into R1.06