Update git submodules

* Update docs/submodules/releng/builder from branch 'master'
  to ec0bb8b700961b1265b2608146f5c794a7852577
  - Extract the yangtools version correctly

    yang-binding no longer defines yangtools in its own dependency
    management, it relies on dom-parent for that. Tighten the XPath
    expression to limit the dependency to yangtools-artifacts.

    Change-Id: I24a0af87b0a461ba9e5d371e753c969969213be4
    Signed-off-by: Stephen Kitt <skitt@redhat.com>

diff --git a/docs/submodules/releng/builder b/docs/submodules/releng/builder
index bad93cff627169b7d34c2a315bbf130ecbfd1215..ec0bb8b700961b1265b2608146f5c794a7852577 160000 (submodule)
--- a/docs/submodules/releng/builder
+++ b/docs/submodules/releng/builder
@@ -1 +1 @@
-Subproject commit bad93cff627169b7d34c2a315bbf130ecbfd1215
+Subproject commit ec0bb8b700961b1265b2608146f5c794a7852577