Update git submodules

* Update docs/submodules/clover from branch 'stable/fraser'
  - Merge "Fix snort rule with blank content & WR packet in alert" into stable/fraser
  - Fix snort rule with blank content & WR packet in alert

    - Fix bug with addition of content field in rule definition
    that causes rules with a blank content fields to inhibit
    snort from starting successfully.
    - Write more of the packet data for snort alert into Redis
    - Above includes X-Real-IP, X-Forwarded-For header fields
    for http traffic from proxy that shows source IP

    Some packet data is missing in alerts from snort.

    Change-Id: I2c5c29e514d1ca9e8e5b9b3f7990afa87c6311b9
    Signed-off-by: Eddie Arrage <eddie.arrage@huawei.com>

diff --git a/docs/submodules/clover b/docs/submodules/clover
index 4502257..6e64b78 160000 (submodule)
--- a/docs/submodules/clover
+++ b/docs/submodules/clover
@@ -1 +1 @@
-Subproject commit 4502257eefd9654f7ea8279f753b2b9be1c8ddd5
+Subproject commit 6e64b78f544be47d20692b39ac8bb1229b33ec7c