vxlan: Use initializer for dummy structures
vxlan: Use initializer for dummy structures

For the notification code, a couple of places build fdb entries on
the stack, use structure initialization instead and fix formatting.

Signed-off-by: Stephen Hemminger <06fa905d7f2aaced6dc72e9511c71a2a51e8aead@networkplumber.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs