Update git submodules

* Update docs/submodules/sdnvpn from branch 'stable/danube'
  - Testcase 3 Apex compatibility fixes
    
    - Workaround a bug releng in getting opedaylight nodes
    - Add some sudo commands because the path is not properly set otherwise
      it seems
    - remove needless command that gets ip information from the compute,
      since that is already available from when the command was ran on the
      controller
    - Handle attaching the quagga instance to Apex's br-ex ovs bridge
    
    Change-Id: I870f1049d9cce696ec26376a09db5f9e9bac0bf9
    Signed-off-by: Romanos Skiadas <rski@intracom-telecom.com>
    (cherry picked from commit b5b2a3abd74f84943cf3fab7ca7da591d326661c)
    
  - Merge "DNS fix for testcase 3" into stable/danube
  - Merge "Fix broken call to re.search()" into stable/danube
  - DNS fix for testcase 3
    
    The CI fails because the openstack DNS does not work.
    Make the VMs use 8.8.8.8
    
    Change-Id: If0c45710cda402158171ce3436731d96bc346565
    JIRA: SDNVPN-125
    Signed-off-by: Romanos Skiadas <rski@intracom-telecom.com>
    (cherry picked from commit f7a6f2593a1b99a0bd0459093d606dd4bdbb999a)
    
  - Create flavor for Quagga ubuntu VM
    
    - Implement a  new function in lib/utils ensures
    (gets or creates) a new flavor existence
    - Use this new function within Testcase3, in order
    to create a flavor big enough to start ubuntu with
    
    JIRA: SDNVPN-120
    
    Change-Id: I5c7d9c855f083b96bfd056bb5d935baa851420c9
    Signed-off-by: tomsou <soth@intracom-telecom.com>
    (cherry picked from commit f368948e25f78c64c328662b52d6b139b02826b4)
    
  - Fix broken call to re.search()
    
    Change-Id: I3d49c683c81e136967432acd1d28b6d305cfe90f
    Signed-off-by: Romanos Skiadas <rski@intracom-telecom.com>
    (cherry picked from commit 28c5fc2391e133e4b76f1bed8675bc9610ebdf9b)
    
  - Fix most end-to-end issues with testcase 3 and reenable it
    
    - Make the test work end-to-end on Fuel
    - Use the instance log to verify quagga started
    - Don't attempt to check for peering, as that is for
    a future release
    - Use the external IP of the controller for peering
    - Fix not getting the output of OpenDaylight commands
    
    Change-Id: Ia7bb533ab65e0fca6b7f48bb64133f6d8f3ff8ae
    JIRA: SDNVPN-114
    Signed-off-by: Romanos Skiadas <rski@intracom-telecom.com>
    (cherry picked from commit 6674049b09d02fe0dc7e11e007e710643cdd49ca)
    
  - Merge "Adding Labels" into stable/danube
  - Merge "Set unlimited instance quotas to fix CI" into stable/danube
  - Set unlimited instance quotas to fix CI
    
    JIRA: SDNVPN-115
    
    Change-Id: I4e24800e897702b8b5aa5ef0227925d66d552f02
    Signed-off-by: tomsou <soth@intracom-telecom.com>
    (cherry picked from commit 38e72ad1c9e4fbf4421e6314ab9a5468a5b29d34)
    
  - Adding Labels
    
    Labels serve as anchors/ refs when referenced from other documents
    This patch adds labels to docs/*/*/index.rst
    
    Change-Id: Iaba02fccac1cbd164a44a7fef913572b1819b00c
    Signed-off-by: ShubhamRathi <shubhamiiitbackup@gmail.com>
    (cherry picked from commit 611651c82af07246775ec4aedb3ffeac74ea1ea7)
    
  - Implement a get VM IP function in utils to be used within test cases
    
    Change-Id: Iaedbfb2fc626eb7d88badee2530593b43c0d1152
    Signed-off-by: tomsou <soth@intracom-telecom.com>
    (cherry picked from commit 7efb216ca8357533dd040cccc49cb5effec42615)
    
  - Merge "Fix typo in quagga script and call to glance" into stable/danube
  - Merge "Fix quagga peering by working around the NAT" into stable/danube
  - Fix quagga peering by working around the NAT
    
    Quagga peering doesn't seem to work over the NATted openstack external
    network. To work around this, directly patch the quagga instance to the
    external network and give it a fixed IP in that network. Then, all the
    peering traffic goes over that patched interface.
    
    Change-Id: I8d9d8fef4e86839c821f83e564d5c49cc15e43ae
    JIRA: SDNVPN-114
    Signed-off-by: Romanos Skiadas <rski@intracom-telecom.com>
    (cherry picked from commit 1ad4cd4d35bcd0d4d9898650eb0452b184b55f77)
    
  - Fix typo in quagga script and call to glance
    
    Change-Id: I80ce2f3b442bc7862486368822c8fe2cd13a0f1b
    JIRA: SDNVPN-114
    Signed-off-by: Romanos Skiadas <rski@intracom-telecom.com>
    (cherry picked from commit 7b1e45de5574cd35013910e746756d0718a45ceb)
    
  - Fix bgpd.conf path and duplication in tc_3
    
    Change-Id: I78e521fddd8a156d5c9597d6307ac9b6f2571f5c
    Signed-off-by: Romanos Skiadas <rski@intracom-telecom.com>
    (cherry picked from commit 4c9d7aa555b450c5c3cb88debed7f2f62f884346)
    

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