[201811] advance sub module head for platform-common, swss, swss-common

Submodule src/sonic-platform-common ac7fde6..58f9672:
  > [sfp_base] Raise exceptions (previously was incorrectly returning them) (sonic-net#61)

Submodule src/sonic-swss 660530e..2974844:
  > Fix MIRROR_SESSION table macro name (sonic-net#802)
  > Don't try to remove a vxlan tunnel if it has associated tunnel maps (sonic-net#1052)

Submodule src/sonic-swss-common d6140fa..d7b1f53:
  > Fix MIRROR_SESSION table macro name (sonic-net#264)

Signed-off-by: Ying Xie <ying.xie@microsoft.com>