Update git submodules

* Update docs/submodules/pharos from branch 'stable/euphrates'
  - Update eyaml README

    On CentOS7 systems the gem command is contained in the 'rubygems'
    package, not 'ruby-gems'.

    After the keys have been moved, there is not reason to keep around the
    'keys' directory.

    Change-Id: I5cb9f474276de75b650ddf323a279e139fb62d37
    Signed-off-by: Trevor Bramwell <tbramwell@linuxfoundation.org>
    (cherry picked from commit cef924d0f6a1a8df8ad4d61b425e2a0b29e25027)

diff --git a/docs/submodules/pharos b/docs/submodules/pharos
index 198e4d5..b7316b6 160000 (submodule)
--- a/docs/submodules/pharos
+++ b/docs/submodules/pharos
@@ -1 +1 @@
-Subproject commit 198e4d5d6514c7e6de4bafde75109ede5662b596
+Subproject commit b7316b60e93ad4bd9291f36965adbef4a0581eeb