Update git submodules

Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  to f0c44b1ae02ffbdb87da81dac7b6754c641d8c04
  - Introduce XCI installer

    After the expression of the need to run the dovetail tool
    over the XCI installer, the investigation to that direction has
    been started.

    The aim of this patch is to introduce the relevant impact either
    on dovetail's code or on dovetail's documentation.

    JIRA: DOVETAIL-766

    Change-Id: I6931506cb80baa4fa4288141ba86a858bc4215b0
    Signed-off-by: Panagiotis Karalis <pkaralis@intracom-telecom.com>