Update git submodules

* Update upstream/fuel from branch 'stable/colorado'
  - Integration of fuel-plugin-tacker

    JIRA: FUEL-205

    This change integrates https://github.com/openstack/fuel-plugin-tacker
    to the Fuel project.

    Change-Id: I51b1bdeeb678e55b85393f6a9f8180fc79322e8f
    Signed-off-by: George Paraskevopoulos <geopar@intracom-telecom.com>
    (cherry picked from commit d91a7fc7cc9d853a9e5c56f87b6cd22ca11ab9a2)

diff --git a/upstream/fuel b/upstream/fuel
index 8e501a8..4ecd23b 160000 (submodule)
--- a/upstream/fuel
+++ b/upstream/fuel
@@ -1 +1 @@
-Subproject commit 8e501a8589db2c5f29a43b5fb2d253c431397b4f
+Subproject commit 4ecd23bbb7287076db2fa704f43c387288cae648