Update git submodules

Update git submodules

* Update docs/submodules/snaps from branch 'master'
  - Merge "Added ability to add a floating IP to an existing instance"
  - Added ability to add a floating IP to an existing instance

    Patch includes:
    1. Ability to easily retrive an initialized OpenStackVmInstance object
    2. Added method to OpenStackVmInstance named "add_floating_ip"
    3. Tests to ensure floating IPs added after initialization actually work

    JIRA: SNAPS-241, SNAPS-242

    Change-Id: I1f413645a752c17fd624ecff26e851068bb77e3f
    Signed-off-by: spisarski <s.pisarski@cablelabs.com>