Submodule update [sonic-swss]

d03c6cc (HEAD -> 201911, origin/201911) [intfsorch] Init proxy_arp variable while adding router interface. (#1473)
9e7c0bc [drop counters] Clarify log messages for initial counter setup (#1445)
da8ac75 Create vnet tunnel map only if it doesn't exist (#1482)

Signed-off-by: Abhishek Dosi <abdosi@microsoft.com>