Updated git submodules

Project: policy/engine master 7e51fc7eb12e2a1aa197b2a0b6bd4fea26aa5c0a

Fix type in dependency.json

The BRMSGW was unable to generate rules artifacts during docker
installation due to an unresolved dependency. A typo was discovered
in the problematic dependency which was causing the error.

Issue-ID: POLICY-660
Change-Id: If4dbe5e640f10d063fa5643112338b10fd29187d
Signed-off-by: Daniel Cruz <dc443y@att.com>

diff --git a/docs/submodules/policy/engine.git b/docs/submodules/policy/engine.git
index bfed41c..7e51fc7 160000 (submodule)
--- a/docs/submodules/policy/engine.git
+++ b/docs/submodules/policy/engine.git
@@ -1 +1 @@
-Subproject commit bfed41c8a4244d222d4cf4dd1d1068fddd42267e
+Subproject commit 7e51fc7eb12e2a1aa197b2a0b6bd4fea26aa5c0a