Update git submodules

Update git submodules

* Update docs/submodules/snaps from branch 'stable/fraser'
  - Extra changes on Flavor Config

    JIRA: SNAPS-254

    Change-Id: I4f18c0d11fe2e8456c0ebce0681f22e3e1daf6bf
    Signed-off-by: Panagiotis Karalis <pkaralis@intracom-telecom.com>
     (cherry picked from commit c5fd2310c8e9f63cf607de7fa9c21f60ab877224)

  - Patch to make flavor configuration for tests more flexible.

    JIRA: SNAPS-254

    Change-Id: Ib81569df499bbf0652c2025fc7de37af92525f7f
    Signed-off-by: spisarski <s.pisarski@cablelabs.com>
    Signed-off-by: Panagiotis Karalis <pkaralis@intracom-telecom.com>
     (cherry picked from commit 44e8131216787127980558824b2a1def94fe317e)