Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Merge "Clarify criteria for testcase inclusion as running in Functest/CI And additional clarifications."
  - Clarify criteria for testcase inclusion as running in Functest/CI
    And additional clarifications.

    JIRA: DOVETAIL-477
    Replace tabs.
    Further clarify testing programs and optionality criteria.

    Change-Id: I8eebdf215fb7cc75a6da9748629b1a73d0b71d19
    Signed-off-by: Bryan Sullivan <bryan.sullivan@att.com>

diff --git a/docs/submodules/dovetail b/docs/submodules/dovetail
index 7e0f6ff..904e58d 160000 (submodule)
--- a/docs/submodules/dovetail
+++ b/docs/submodules/dovetail
@@ -1 +1 @@
-Subproject commit 7e0f6ff7f01b2606e854931d1dd5ed1d12a7547f
+Subproject commit 904e58deea73add93828010021b991d4ff996675