Update git submodules

* Update docs/submodules/snaps from branch 'master'
  - Merge "Created new classes RouterSettingsError & RouterCreationError."
  - Created new classes RouterSettingsError & RouterCreationError.

    Raising RouterSettingsError in RouterSettings and RouterCreationError in
    OpenStackRouter instead of Exception.

    JIRA: SNAPS-136

    Change-Id: I3ba4824ea80ccfc07b1f15959898936d51bca1de
    Signed-off-by: spisarski <s.pisarski@cablelabs.com>

diff --git a/docs/submodules/snaps b/docs/submodules/snaps
index ad93546..a2b4763 160000 (submodule)
--- a/docs/submodules/snaps
+++ b/docs/submodules/snaps
@@ -1 +1 @@
-Subproject commit ad9354631208bc565dbbade119c6be89b4a6a5d4
+Subproject commit a2b4763d5fe13bfe47de0d44e7d7c519f1084215