Update git submodules

* Update docs/submodules/netconf from branch 'master'
  to 25c04325db99998074a502ef4ebf82fbb1ca97aa
  - Minimize yangtools dependencies and bump to 2.0.1

    Squash dependencies so that netconf features are pulling in
    the bare minimum set of yangtools features directly and use
    version ranges for them.

    Properties should be avoided and inter-project dependencies should
    be expressed via ${upstream}-artifacts dependencyManagement import.

    yangtools-2.0.1 contains a fix to multi-revision modules, which are
    badly broken in 2.0.0. It also introduces APIs we require to fix
    compliance with RFC8040 (i.e. follow RFC7159).

    Change-Id: I0e0e63841d511123243560f166db50c2fc9270fb
    Signed-off-by: Robert Varga <robert.varga@pantheon.tech>

diff --git a/docs/submodules/netconf b/docs/submodules/netconf
index 2295d50e7212d80a9bc752f655fa66790ad45022..25c04325db99998074a502ef4ebf82fbb1ca97aa 160000 (submodule)
--- a/docs/submodules/netconf
+++ b/docs/submodules/netconf
@@ -1 +1 @@
-Subproject commit 2295d50e7212d80a9bc752f655fa66790ad45022
+Subproject commit 25c04325db99998074a502ef4ebf82fbb1ca97aa