Update git submodules

* Update docs/submodules/snaps from branch 'master'
  - Refactoring of VmInstanceSettings to extend VmInstanceConfig

    VmInstanceSettings, FloatingIPSettings and nova_utils have a
    runtime cyclical dependency. This patch reduces this dependency and
    deprecates the VmInstanceSettings and FloatingIPSettings class with
    snaps.config.vm_inst VmInstanceConfig and FloatingIpConfg classes

    JIRA: SNAPS-218

    Change-Id: I95688130256bca1df4a5c347bdb741019ae0937e
    Signed-off-by: spisarski <s.pisarski@cablelabs.com>

diff --git a/docs/submodules/snaps b/docs/submodules/snaps
index 6d6a6d7..594e4d2 160000 (submodule)
--- a/docs/submodules/snaps
+++ b/docs/submodules/snaps
@@ -1 +1 @@
-Subproject commit 6d6a6d72ca1050525010bbb9c2569b85e050ad62
+Subproject commit 594e4d2b15dcf59fc7dc1b8380b096382a0b1cb1