In vn update, always take the dns_server_address that was allocated earlier

Change-Id: I899b07792687bffb32f0665923b9397c6ab02697
Add schemas for querying physical router sent statistics related to
PFE memory, fabric usage, and LSP information
Closes-Bug: #1402129

Change-Id: Ia03cb38ff1873fe17fd2a27441f46902c8e39605
Backport Pedro's fix for bug 1399603

Automatic copy constructor for MacAddress doesn't work as expected.
Add DISALLOW_COPY_AND_ASSIGN to prevent the copy constructor from being
used.

Change-Id: Id8ad9456f64a574c2bade9ed584614260cb9b8f6
Partial-Bug: #1399603
Merge "In vn update, always take the dns_server_address that was allocated earlier"
Merge "Add schemas for querying physical router sent statistics related to PFE memory, fabric usage, and LSP information Closes-Bug: #1402129"
Merge "Backport Pedro's fix for bug 1399603"
Fix cpplint errors for bgp_session_manager.[cc|h]

Change-Id: Ic1d01663758dc48a7fa88af52c5fe03b3c6500f1