Update git submodules

* Update docs/submodules/snaps from branch 'master'
  - Merge "Created new exception classes for networks."
  - Created new exception classes for networks.

    Raising NetworkSettingsError in NetworkSettings, SubnetSettingsError in
    SubnetSettings and PortSettingsError in PortSettings instead of Exception.

    JIRA: SNAPS-134

    Change-Id: I724d9e115e41767a9e3596d85db2a20ee8de5f73
    Signed-off-by: spisarski <s.pisarski@cablelabs.com>

diff --git a/docs/submodules/snaps b/docs/submodules/snaps
index 3e84444..b0af6e9 160000 (submodule)
--- a/docs/submodules/snaps
+++ b/docs/submodules/snaps
@@ -1 +1 @@
-Subproject commit 3e84444f51b9cedc804eb03e4aa9a69cb7a422d9
+Subproject commit b0af6e93bb5cc338c289577aad5c4b1bf8de7053