Updated git submodules

Project: infrautils master d83cefef8c54d9b2066906f8caf22195e61dd015

Cleanup some methods not used

Let's remove some methods not even used within this package. Fix some
issues related to checkstyle as well.

Some methods still used might be eventually replaced by "standard" ones
in later patches.

Change-Id: I74f3cb47ff01f3daa3ee5bcc84de18fc86c84f47
Signed-off-by: David Suarez <david.suarez.fuentes@gmail.com>

diff --git a/docs/submodules/infrautils b/docs/submodules/infrautils
index 155ddd811b61df8d6512bc142b7f4ab8d8eee839..d83cefef8c54d9b2066906f8caf22195e61dd015 160000 (submodule)
--- a/docs/submodules/infrautils
+++ b/docs/submodules/infrautils
@@ -1 +1 @@
-Subproject commit 155ddd811b61df8d6512bc142b7f4ab8d8eee839
+Subproject commit d83cefef8c54d9b2066906f8caf22195e61dd015