Update sonic-swss submodule

* src/sonic-swss 63afbd5...5be3963 (11):
  > Remove the platform check for remove/add port action at init phase. (sonic-net#1006)
  > [test]: Add Class object in each test script file (sonic-net#992)
  > [vstest]: add --imgname option to specify vs image to test (sonic-net#996)
  > [qosorch]: Add cir and pir parameters for scheduler (sonic-net#991)
  > [vstest]: report error when team kernel module is not available (sonic-net#994)
  > Support per buffer pool watermark polling mode (sonic-net#973)
  > [test]: Update test_vlan to use dvs functions (sonic-net#986)
  > Add synchronous switch to orch agent (sonic-net#987)
  > ARM32 bit fixes, for 64bit printf format specifier (sonic-net#989)
  > [portsorch]: Rename function isPortReady() to allPortsReady() (sonic-net#990)
  > [routeorch]: Fix observer detaching procedure for next hop observers (sonic-net#985)

Signed-off-by: Zhenggen Xu <zxu@linkedin.com>