Update git submodules

* Update docs/submodules/releng/builder from branch 'master'
  to f975a3a8acfb231e2e8567f298c169f8e946ec86
  - Merge "Remove extra space between feature repos"
  - Remove extra space between feature repos

    This produces a sed error when job is triggered by another job.
    Also fix yaml file indentation.

    Change-Id: I4e852f6ed28158b767bb51da095b66e803cd42ce
    Signed-off-by: Luis Gomez <ecelgp@gmail.com>

diff --git a/docs/submodules/releng/builder b/docs/submodules/releng/builder
index ef0841037ba803f5af179dbd4694fa3ac8335927..f975a3a8acfb231e2e8567f298c169f8e946ec86 160000 (submodule)
--- a/docs/submodules/releng/builder
+++ b/docs/submodules/releng/builder
@@ -1 +1 @@
-Subproject commit ef0841037ba803f5af179dbd4694fa3ac8335927
+Subproject commit f975a3a8acfb231e2e8567f298c169f8e946ec86