Update git submodules

Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to b55a3a35b75653f9804821432d95ae769ea494b5
  - Merge "update so to use 1.6.3 snapshot from the logging"
  - update so to use 1.6.3 snapshot from the logging

    Updated snapshot to 1.6.3 and began fixing failing tests
    Update SOAPLoggingInInterceptor to use new InvocationID value
    Changed client and server keys to InvocationID
    BPRestCallback to use ServerInvocationId
    Removed logging MDC checking from unit tests
    Began switching bprestcallback to use resttemplate
    Removed changes to logback replacing invocationIds
    Updated logic where requestEntity is created on null message
    Added unit tests for BPRestCallback
    Set InvocationID in MDC in SOAPLoggingInInterceptor
    Send in URI to prevent encoding of URI causing % to change to %25
    Updated restTemplate to fix issue with interceptors

    Issue-ID: SO-2571
    Signed-off-by: Benjamin, Max (mb388a) <mb388a@att.com>
    Change-Id: I7e0d80eae9036c993414ae96ebd571c89cb9dfa9