Update git submodules

Update git submodules

* Update docs/submodules/sdnvpn from branch 'master'
  - remove block comment for testcase_8

    somehow bgpvpn testsuite is not running in the bgpvpn-ha ci loop
    because of testcase_8. when bgpvpn tries to execute this testcase,
    somehow execution is stopped and no logs being generated from the
    setup. The only different is this testcase is having block comment
    with delimeter and this is being imported as a module inside
    run_sdnvpn_tests. Hence replacing block comment with single line
    comments. This issue is very sporadic even in the local setup
    and running fine after changing it with single line comments.

    Change-Id: I5d71ec2a8c532b5dd77b2136ca7e95a7838683dc
    Signed-off-by: Periyasamy Palanisamy <periyasamy.palanisamy@ericsson.com>