Update git submodules

Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to a2fd007e4d1b03f7258d71fa86658510ff2f1790
  - update logging to match onap logging library

    Updated to use changes added to logging library in ONAP
    Updated RestClient to set mdc rather than extend filter
    Updated filter removal to include new spring filter
    Updated to exclude filter causing failure in catdb
    Excluded filter causing failures in requestdb
    Updated requestdbatt to exclude filter
    Updated check for spring filters to fix failing tests

    Issue-ID: SO-2353
    Signed-off-by: Benjamin, Max (mb388a) <mb388a@att.com>
    Change-Id: Idb081a0f5527690f9dc41c7914a2d721f9022aea