Update git submodules

* Update src/sonic-sairedis from branch 'buzznik_dev'
  to ddc871e95f802e415a2794a15b6d1c695ba78b05
  - Update git submodules
    
    * Update SAI from branch 'buzznik_dev'
      to 4faf110842398e4a85679dffaf8eaff401586bd4
      - Merge broadcom_sonic branch to buzznik_dev branch on Tue Jun 18 22:48:00 PDT 2019
        
        Change-Id: I3971a3e0d78df1e260f712a5df21f4ba0852f6ad
        
      - Merge 201904 branch to broadcom_sonic branch on Sun Jun  9 22:42:12 PDT 2019
        
        Change-Id: Ic2ed869d3c9b1694bdee2fcdc9813470ff598336
        
      - Update SAI headers for 3.6.2.1
        
        Change-Id: I7dc59536bbb4df51e189b61ee94d8765bc6fc6ae
        
      - Merge arlo_hw_dev branch build arlo_hw_dev_daily_190529_1519_43 to broadcom_sonic branch
        
        Change-Id: Ibea836b1814ecd27dac69b767f8c67c2bfe78fa0
        
      - changing the URL from github to gerrit for ptf, ctypesgen and behavioral-model submodules
        
        Change-Id: Iaa6f41f32fdf0a8e271f86dadc9415c55941fca9
        
      - [JIRA SONIC-330] Clone: Update SAI headers based on 3.6 branch to include NAT support
        
        Change-Id: Iab1046ede40b815746e57147a1be182ee411c0a0
        
      - Update SAI headers based on 3.6 branch to include NAT support
        
        Change-Id: Iab1046ede40b815746e57147a1be182ee411c0a0
        
      - Merge broadcom_sonic branch to arlo_hw_dev branch
        
        Change-Id: I31b66a9ae284467fef8e8f8ba7f5809153dd77ef
        
      - [bmtor]: Add META_TUNNEL table (sonic-net#941)
        
        Signed-off-by: Marian Pritsak <[email protected]>
      - [packet action] Clarify packet actions: COPY, TRAP, and LOG (sonic-net#928)
        
        * [packet action] Clarify packet actions: COPY, TRAP, and LOG
        
        Signed-off-by: Ying Xie <[email protected]>