[201811][swss] advance swss submodule head (#3897)

Submodule src/sonic-swss 8ef513c..f6bfe77:
  > [aclorch] Enable DSCP rules on IPv6 mirror tables (#1146)

Signed-off-by: Ying Xie <ying.xie@microsoft.com>
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Ying Xie 2019-12-13 10:37:51 -08:00 committed by GitHub
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commit 06c69ee75e
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Subproject commit 8ef513c88d3964d2268496d21b8f633a742e356d
Subproject commit f6bfe77db9055257936e60e9e1666ed653188a4d