Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Merge "Do not grep log text to determine failure"
  - Do not grep log text to determine failure

    Pipefail should be sufficient to determine the failure so this
    change gets rid of grepping the logs for failure and unreachable
    to leave the evaluation to bash itself.

    Change-Id: Ie928438c1503b086159276af4308f5549b58cb71
    Signed-off-by: Fatih Degirmenci <fdegir@gmail.com>

diff --git a/docs/submodules/releng-xci b/docs/submodules/releng-xci
index 990f97e..d88ee53 160000 (submodule)
--- a/docs/submodules/releng-xci
+++ b/docs/submodules/releng-xci
@@ -1 +1 @@
-Subproject commit 990f97e9ebf417dd18e533cbbfec8977fe59f39a
+Subproject commit d88ee53b7eceeee2e59ba3bc2a862722185c0e87