Update git submodules

* Update docs/submodules/pharos from branch 'stable/euphrates'
  - [fuel] Add MaaS PXE network to installer adapter

    JIRA: FUEL-313

    Change-Id: I046ea732e1047f793f1b3bc6f7fc31cfcee9ff40
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    (cherry picked from commit 5aae093570a37ea91b8c11fa8e116deb1773abc2)

diff --git a/docs/submodules/pharos b/docs/submodules/pharos
index ff8457d..50d5741 160000 (submodule)
--- a/docs/submodules/pharos
+++ b/docs/submodules/pharos
@@ -1 +1 @@
-Subproject commit ff8457dedbdad4207557d9b9d91000a1b2990d34
+Subproject commit 50d5741d8a922faaaad51b36a5cd9b4bb90dde99