Update git submodules

* Update os-collect-config from branch 'master'
  to 18a6e258ed8cf971d968ccebcab4175553fe2a7a
  - Replace deprecated warn method

    The warn method of logger instances has been deprecated. Use warning
    instead.

    Change-Id: Id91fb61514f36c82d275d6e0f9654b031bc3890a
    Signed-off-by: Takashi Kajinami <kajinamit@oss.nttdata.com>

diff --git a/os-collect-config b/os-collect-config
index 07b9e69798a2c80d61d110be907d4eb457e949a3..18a6e258ed8cf971d968ccebcab4175553fe2a7a 160000 (submodule)
--- a/os-collect-config
+++ b/os-collect-config
@@ -1 +1 @@
-Subproject commit 07b9e69798a2c80d61d110be907d4eb457e949a3
+Subproject commit 18a6e258ed8cf971d968ccebcab4175553fe2a7a